22 files changed, 764 insertions, 146 deletions
diff --git a/indra/cmake/Boost.cmake b/indra/cmake/Boost.cmake
index c499807d75..a4f81917ea 100644
--- a/indra/cmake/Boost.cmake
+++ b/indra/cmake/Boost.cmake
@@ -9,19 +9,30 @@ if( USE_CONAN )
   target_compile_definitions( ll::boost INTERFACE BOOST_ALLOW_DEPRECATED_HEADERS BOOST_BIND_GLOBAL_PLACEHOLDERS )
   return()
 elseif( NOT USE_AUTOBUILD_3P )
-  find_package( Boost REQUIRED )
-  target_compile_definitions( ll::boost INTERFACE BOOST_BIND_GLOBAL_PLACEHOLDERS )
   if (DARWIN)
-    set(sfx "-mt")
-  endif()
-  target_link_libraries( ll::boost INTERFACE
-	  boost_context${sfx}
-	  boost_fiber${sfx}
-	  boost_filesystem${sfx}
-	  boost_program_options${sfx}
-	  boost_regex${sfx}
-	  boost_system${sfx}
-	  boost_thread${sfx})
+    target_include_directories( ll::boost SYSTEM INTERFACE /opt/local/libexec/boost/1.81/include)
+    target_link_libraries( ll::boost INTERFACE
+      /opt/local/libexec/boost/1.81/lib/libboost_context-mt.a
+      /opt/local/libexec/boost/1.81/lib/libboost_fiber-mt.a
+      /opt/local/libexec/boost/1.81/lib/libboost_filesystem-mt.a
+      /opt/local/libexec/boost/1.81/lib/libboost_program_options-mt.a
+      /opt/local/libexec/boost/1.81/lib/libboost_regex-mt.a
+      /opt/local/libexec/boost/1.81/lib/libboost_system-mt.a
+      /opt/local/libexec/boost/1.81/lib/libboost_thread-mt.a
+      )
+  else (DARWIN)
+    find_package( Boost REQUIRED )
+    target_link_libraries( ll::boost INTERFACE
+      boost_context
+      boost_fiber
+      boost_filesystem
+      boost_program_options
+      boost_regex
+      boost_system
+      boost_thread
+      )
+  endif (DARWIN)
+  target_compile_definitions( ll::boost INTERFACE BOOST_BIND_GLOBAL_PLACEHOLDERS )
   return()
 endif()
 
diff --git a/indra/cmake/BuildVersion.cmake b/indra/cmake/BuildVersion.cmake
index 3b09cc4321..aa151bafc8 100644
--- a/indra/cmake/BuildVersion.cmake
+++ b/indra/cmake/BuildVersion.cmake
@@ -55,10 +55,4 @@ if (NOT DEFINED VIEWER_SHORT_VERSION) # will be true in indra/, false in indra/n
         "LL_VIEWER_VERSION_BUILD=${VIEWER_VERSION_REVISION}"
         "LLBUILD_CONFIG=\"${CMAKE_BUILD_TYPE}\""
         )
-if (PACKAGE)
-	include(CPack)
-	set(CPACK_PACKAGE_VERSION
-		${VIEWER_VERSION_MAJOR}.${VIEWER_VERSION_MINOR}.${VIEWER_VERSION_PATCH}.${VIEWER_VERSION_REVISION}
-		CACHE STRING "Viewer major.minor.patch.revision versions.")
-endif (PACKAGE)
 endif (NOT DEFINED VIEWER_SHORT_VERSION)
diff --git a/indra/cmake/CEFPlugin.cmake b/indra/cmake/CEFPlugin.cmake
index 7b0a945bc4..119a41f570 100644
--- a/indra/cmake/CEFPlugin.cmake
+++ b/indra/cmake/CEFPlugin.cmake
@@ -5,8 +5,47 @@ include(Prebuilt)
 include_guard()
 add_library( ll::cef INTERFACE IMPORTED )
 
-#use_prebuilt_binary(dullahan)
-target_include_directories( ll::cef SYSTEM INTERFACE ${LIBS_PREBUILT_DIR}/include ${LIBS_PREBUILT_DIR}/include/cef)
+if (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+    if (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/dullahan_installed OR NOT ${dullahan_installed} EQUAL 0)
+        if (NOT EXISTS ${CMAKE_BINARY_DIR}/dullahan-1.14.0.202312131437_118.7.1_g99817d2_chromium-118.0.5993.119-darwin64-242070244.tar.bz2)
+            file(DOWNLOAD
+                https://megapahit.net/downloads/dullahan-1.14.0.202312131437_118.7.1_g99817d2_chromium-118.0.5993.119-darwin64-242070244.tar.bz2
+                ${CMAKE_BINARY_DIR}/dullahan-1.14.0.202312131437_118.7.1_g99817d2_chromium-118.0.5993.119-darwin64-242070244.tar.bz2
+                SHOW_PROGRESS
+                )
+        endif (NOT EXISTS ${CMAKE_BINARY_DIR}/dullahan-1.14.0.202312131437_118.7.1_g99817d2_chromium-118.0.5993.119-darwin64-242070244.tar.bz2)
+        file(ARCHIVE_EXTRACT
+            INPUT ${CMAKE_BINARY_DIR}/dullahan-1.14.0.202312131437_118.7.1_g99817d2_chromium-118.0.5993.119-darwin64-242070244.tar.bz2
+            DESTINATION ${LIBS_PREBUILT_DIR}
+            )
+        file(WRITE ${PREBUILD_TRACKING_DIR}/dullahan_installed "0")
+    endif (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/dullahan_installed OR NOT ${dullahan_installed} EQUAL 0)
+elseif (CMAKE_OSX_ARCHITECTURES MATCHES x86_64)
+    if (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/dullahan_installed OR NOT ${dullahan_installed} EQUAL 0)
+        if (NOT EXISTS ${CMAKE_BINARY_DIR}/dullahan-1.14.0.202312131437_118.7.1_g99817d2_chromium-118.0.5993.119-darwin64-242070158.tar.bz2)
+            file(DOWNLOAD
+                https://megapahit.net/downloads/dullahan-1.14.0.202312131437_118.7.1_g99817d2_chromium-118.0.5993.119-darwin64-242070158.tar.bz2
+                ${CMAKE_BINARY_DIR}/dullahan-1.14.0.202312131437_118.7.1_g99817d2_chromium-118.0.5993.119-darwin64-242070158.tar.bz2
+                SHOW_PROGRESS
+                )
+        endif (NOT EXISTS ${CMAKE_BINARY_DIR}/dullahan-1.14.0.202312131437_118.7.1_g99817d2_chromium-118.0.5993.119-darwin64-242070158.tar.bz2)
+        file(ARCHIVE_EXTRACT
+            INPUT ${CMAKE_BINARY_DIR}/dullahan-1.14.0.202312131437_118.7.1_g99817d2_chromium-118.0.5993.119-darwin64-242070158.tar.bz2
+            DESTINATION ${LIBS_PREBUILT_DIR}
+            )
+        file(WRITE ${PREBUILD_TRACKING_DIR}/dullahan_installed "0")
+    endif (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/dullahan_installed OR NOT ${dullahan_installed} EQUAL 0)
+else (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+use_prebuilt_binary(dullahan)
+  if (${LINUX_DISTRO} MATCHES fedora)
+    execute_process(
+      COMMAND patchelf --remove-rpath bin/release/dullahan_host
+      WORKING_DIRECTORY ${LIBS_PREBUILT_DIR}
+      )
+  endif (${LINUX_DISTRO} MATCHES fedora)
+endif (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+
+target_include_directories( ll::cef SYSTEM INTERFACE  ${LIBS_PREBUILT_DIR}/include/cef)
 
 if (WINDOWS)
     target_link_libraries( ll::cef INTERFACE
diff --git a/indra/cmake/CURL.cmake b/indra/cmake/CURL.cmake
index d47e2a765c..60b74d3727 100644
--- a/indra/cmake/CURL.cmake
+++ b/indra/cmake/CURL.cmake
@@ -4,8 +4,102 @@ include(Prebuilt)
 include_guard()
 add_library( ll::libcurl INTERFACE IMPORTED )
 
-#use_system_binary(libcurl)
-#use_prebuilt_binary(curl)
+if (NOT USESYSTEMLIBS)
+use_system_binary(libcurl)
+endif (NOT USESYSTEMLIBS)
+if (LINUX OR NOT USESYSTEMLIBS)
+use_prebuilt_binary(curl)
+elseif (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/curl_installed OR NOT ${curl_installed} EQUAL 0)
+  if (NOT EXISTS ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1.tar.gz)
+    file(DOWNLOAD
+      https://github.com/secondlife/3p-curl/archive/refs/tags/v7.54.1-r1.tar.gz
+      ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1.tar.gz
+      )
+  endif (NOT EXISTS ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1.tar.gz)
+  file(ARCHIVE_EXTRACT
+    INPUT ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1.tar.gz
+    DESTINATION ${CMAKE_BINARY_DIR}
+    )
+  file(
+    COPY
+      ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1/curl/include/curl/curl.h
+      ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1/curl/include/curl/curlbuild.h
+      ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1/curl/include/curl/curlrules.h
+      ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1/curl/include/curl/curlver.h
+      ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1/curl/include/curl/easy.h
+      ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1/curl/include/curl/mprintf.h
+      ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1/curl/include/curl/multi.h
+      ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1/curl/include/curl/stdcheaders.h
+      ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1/curl/include/curl/system.h
+      ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1/curl/include/curl/typecheck-gcc.h
+    DESTINATION ${LIBS_PREBUILT_DIR}/include/curl
+    )
+  file(
+    COPY
+      ${LIBS_PREBUILT_DIR}/lib/release/libcrypto.a
+      ${LIBS_PREBUILT_DIR}/lib/release/libssl.a
+    DESTINATION ${LIBS_PREBUILT_DIR}/lib
+    )
+  message("We need to temporarily have OpenSSL3 header directory and libraries renamed just until the libcurl building process with OpenSSL1.1 now is finished.")
+  if (DARWIN)
+    set(ENV{CFLAGS} "-arch ${CMAKE_OSX_ARCHITECTURES} -mmacosx-version-min=10.15 -std=c90")
+    execute_process(COMMAND sudo mv /opt/local/include/openssl /opt/local/include/openssl3)
+    execute_process(COMMAND sudo mv /opt/local/lib/libcrypto.a /opt/local/lib/libcrypto.a.3)
+    execute_process(COMMAND sudo mv /opt/local/lib/libcrypto.dylib /opt/local/lib/libcrypto.dylib.3)
+    execute_process(COMMAND sudo mv /opt/local/lib/libssl.a /opt/local/lib/libssl.a.3)
+    execute_process(COMMAND sudo mv /opt/local/lib/libssl.dylib /opt/local/lib/libssl.dylib.3)
+    if (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+      execute_process(
+        COMMAND ./configure --host=aarch64-apple-darwin --disable-alt-svc --disable-dict --disable-doh --disable-file --disable-gopher --disable-headers-api --disable-hsts --disable-imap --disable-ldap --disable-ldaps --disable-libcurl-option --disable-manual --disable-mqtt --disable-ntlm --disable-ntlm-wb --disable-pop3 --disable-rtsp --disable-shared --disable-smb --disable-smtp --disable-sspi --disable-telnet --disable-tftp --disable-tls-srp --disable-unix-sockets --disable-verbose --disable-versioned-symbols --enable-threaded-resolver --with-ssl=${LIBS_PREBUILT_DIR} --without-libidn2 --without-libpsl --without-libssh2
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1/curl
+        )
+    else (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+      execute_process(
+        COMMAND ./configure --host=${CMAKE_OSX_ARCHITECTURES}-apple-darwin --disable-alt-svc --disable-dict --disable-doh --disable-file --disable-gopher --disable-headers-api --disable-hsts --disable-imap --disable-ldap --disable-ldaps --disable-libcurl-option --disable-manual --disable-mqtt --disable-ntlm --disable-ntlm-wb --disable-pop3 --disable-rtsp --disable-shared --disable-smb --disable-smtp --disable-sspi --disable-telnet --disable-tftp --disable-tls-srp --disable-unix-sockets --disable-verbose --disable-versioned-symbols --enable-threaded-resolver --with-ssl=${LIBS_PREBUILT_DIR} --without-libidn2 --without-libpsl --without-libssh2
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1/curl
+        )
+    endif (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+  else (DARWIN)
+    execute_process(COMMAND sudo mv /usr/include/openssl /usr/include/openssl3)
+    execute_process(COMMAND sudo mv /usr/lib/libcrypto.a /usr/lib/libcrypto.a.3)
+    execute_process(COMMAND sudo mv /usr/lib/libcrypto.so /usr/lib/libcrypto.so.3)
+    execute_process(COMMAND sudo mv /usr/lib/libssl.a /usr/lib/libssl.a.3)
+    execute_process(COMMAND sudo mv /usr/lib/libssl.so /usr/lib/libssl.so.3)
+    execute_process(
+      COMMAND ./configure --disable-alt-svc --disable-dict --disable-doh --disable-file --disable-gopher --disable-headers-api --disable-hsts --disable-imap --disable-ldap --disable-ldaps --disable-libcurl-option --disable-manual --disable-mqtt --disable-ntlm --disable-ntlm-wb --disable-pop3 --disable-rtsp --disable-shared --disable-smb --disable-smtp --disable-sspi --disable-telnet --disable-tftp --disable-tls-srp --disable-unix-sockets --disable-verbose --disable-versioned-symbols --enable-threaded-resolver --with-ssl=${LIBS_PREBUILT_DIR} --without-libidn2 --without-libpsl --without-libssh2
+      WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1/curl
+      )
+  endif (DARWIN)
+  execute_process(
+    COMMAND make -j${MAKE_JOBS}
+    WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1/curl
+    RESULT_VARIABLE curl_installed
+    )
+  file(
+    COPY ${CMAKE_BINARY_DIR}/3p-curl-7.54.1-r1/curl/lib/.libs/libcurl.a
+    DESTINATION ${LIBS_PREBUILT_DIR}/lib/release
+    )
+  if (DARWIN)
+    unset(ENV{CFLAGS})
+    execute_process(COMMAND sudo mv /opt/local/include/openssl3 /opt/local/include/openssl)
+    execute_process(COMMAND sudo mv /opt/local/lib/libcrypto.a.3 /opt/local/lib/libcrypto.a)
+    execute_process(COMMAND sudo mv /opt/local/lib/libcrypto.dylib.3 /opt/local/lib/libcrypto.dylib)
+    execute_process(COMMAND sudo mv /opt/local/lib/libssl.a.3 /opt/local/lib/libssl.a)
+    execute_process(COMMAND sudo mv /opt/local/lib/libssl.dylib.3 /opt/local/lib/libssl.dylib)
+  else (DARWIN)
+    execute_process(COMMAND sudo mv /usr/include/openssl3 /usr/include/openssl)
+    execute_process(COMMAND sudo mv /usr/lib/libcrypto.a.3 /usr/lib/libcrypto.a)
+    execute_process(COMMAND sudo mv /usr/lib/libcrypto.so.3 /usr/lib/libcrypto.so)
+    execute_process(COMMAND sudo mv /usr/lib/libssl.a.3 /usr/lib/libssl.a)
+    execute_process(COMMAND sudo mv /usr/lib/libssl.so.3 /usr/lib/libssl.so)
+  endif (DARWIN)
+  message("OpenSSL3 header directory and library names have been restored.")
+  file(REMOVE
+    ${LIBS_PREBUILT_DIR}/lib/libcrypto.a
+    ${LIBS_PREBUILT_DIR}/lib/libssl.a
+    )
+  file(WRITE ${PREBUILD_TRACKING_DIR}/curl_installed "${curl_installed}")
+endif (LINUX OR NOT USESYSTEMLIBS)
 if (WINDOWS)
   target_link_libraries(ll::libcurl INTERFACE libcurl.lib)
 else (WINDOWS)
diff --git a/indra/cmake/FMODSTUDIO.cmake b/indra/cmake/FMODSTUDIO.cmake
index 38437b7bfb..313ee2cde7 100644
--- a/indra/cmake/FMODSTUDIO.cmake
+++ b/indra/cmake/FMODSTUDIO.cmake
@@ -30,9 +30,68 @@ if (USE_FMODSTUDIO)
     # Note: if you're not using INSTALL_PROPRIETARY, the package URL should be local (file:/// URL)
     # as accessing the private LL location will fail if you don't have the credential
     include(Prebuilt)
-    if (NOT USESYSTEMLIBS)
+    if (USESYSTEMLIBS AND (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/fmodstudio_installed OR NOT ${fmodstudio_installed} EQUAL 0))
+      file(MAKE_DIRECTORY ${LIBS_PREBUILT_DIR}/lib/release)
+      if (DARWIN)
+        execute_process(
+          COMMAND hdiutil attach -noverify fmodstudioapi20223mac-installer.dmg
+          WORKING_DIRECTORY $ENV{HOME}/Downloads
+          )
+        file(
+          COPY
+            /Volumes/FMOD\ Programmers\ API\ Mac/FMOD\ Programmers\ API/api/core/inc/fmod.h
+            /Volumes/FMOD\ Programmers\ API\ Mac/FMOD\ Programmers\ API/api/core/inc/fmod.hpp
+            /Volumes/FMOD\ Programmers\ API\ Mac/FMOD\ Programmers\ API/api/core/inc/fmod_codec.h
+            /Volumes/FMOD\ Programmers\ API\ Mac/FMOD\ Programmers\ API/api/core/inc/fmod_common.h
+            /Volumes/FMOD\ Programmers\ API\ Mac/FMOD\ Programmers\ API/api/core/inc/fmod_dsp.h
+            /Volumes/FMOD\ Programmers\ API\ Mac/FMOD\ Programmers\ API/api/core/inc/fmod_dsp_effects.h
+            /Volumes/FMOD\ Programmers\ API\ Mac/FMOD\ Programmers\ API/api/core/inc/fmod_errors.h
+            /Volumes/FMOD\ Programmers\ API\ Mac/FMOD\ Programmers\ API/api/core/inc/fmod_output.h
+          DESTINATION ${LIBS_PREBUILT_DIR}/include/fmodstudio
+          )
+        execute_process(
+          COMMAND lipo
+            lib/libfmod.dylib
+            -thin ${CMAKE_OSX_ARCHITECTURES}
+            -output ${LIBS_PREBUILT_DIR}/lib/release/libfmod.dylib
+          WORKING_DIRECTORY /Volumes/FMOD\ Programmers\ API\ Mac/FMOD\ Programmers\ API/api/core
+          )
+        execute_process(
+          COMMAND hdiutil detach FMOD\ Programmers\ API\ Mac
+          WORKING_DIRECTORY /Volumes
+          RESULT_VARIABLE fmodstudio_installed
+          )
+        file(WRITE ${PREBUILD_TRACKING_DIR}/fmodstudio_installed "${fmodstudio_installed}")
+      else (DARWIN)
+        file(ARCHIVE_EXTRACT
+          INPUT $ENV{HOME}/Downloads/fmodstudioapi20223linux.tar.gz
+          DESTINATION ${CMAKE_BINARY_DIR}
+          )
+        file(
+          COPY
+            ${CMAKE_BINARY_DIR}/fmodstudioapi20223linux/api/core/inc/fmod.h
+            ${CMAKE_BINARY_DIR}/fmodstudioapi20223linux/api/core/inc/fmod.hpp
+            ${CMAKE_BINARY_DIR}/fmodstudioapi20223linux/api/core/inc/fmod_codec.h
+            ${CMAKE_BINARY_DIR}/fmodstudioapi20223linux/api/core/inc/fmod_common.h
+            ${CMAKE_BINARY_DIR}/fmodstudioapi20223linux/api/core/inc/fmod_dsp.h
+            ${CMAKE_BINARY_DIR}/fmodstudioapi20223linux/api/core/inc/fmod_dsp_effects.h
+            ${CMAKE_BINARY_DIR}/fmodstudioapi20223linux/api/core/inc/fmod_errors.h
+            ${CMAKE_BINARY_DIR}/fmodstudioapi20223linux/api/core/inc/fmod_output.h
+          DESTINATION ${LIBS_PREBUILT_DIR}/include/fmodstudio
+          )
+        file(
+          COPY
+            ${CMAKE_BINARY_DIR}/fmodstudioapi20223linux/api/core/lib/${CMAKE_SYSTEM_PROCESSOR}/libfmod.so
+            ${CMAKE_BINARY_DIR}/fmodstudioapi20223linux/api/core/lib/${CMAKE_SYSTEM_PROCESSOR}/libfmod.so.13
+            ${CMAKE_BINARY_DIR}/fmodstudioapi20223linux/api/core/lib/${CMAKE_SYSTEM_PROCESSOR}/libfmod.so.13.23
+          DESTINATION ${LIBS_PREBUILT_DIR}/lib/release
+          FOLLOW_SYMLINK_CHAIN
+          )
+        file(WRITE ${PREBUILD_TRACKING_DIR}/fmodstudio_installed "0")
+      endif (DARWIN)
+    else (USESYSTEMLIBS AND (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/fmodstudio_installed OR NOT ${fmodstudio_installed} EQUAL 0))
     use_prebuilt_binary(fmodstudio)
-    endif ()
+    endif (USESYSTEMLIBS AND (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/fmodstudio_installed OR NOT ${fmodstudio_installed} EQUAL 0))
     if (WINDOWS)
       target_link_libraries( ll::fmodstudio INTERFACE  fmod_vc)
     elseif (DARWIN)
@@ -42,9 +101,7 @@ if (USE_FMODSTUDIO)
       target_link_libraries( ll::fmodstudio INTERFACE  fmod)
     endif (WINDOWS)
 
-    if (NOT USESYSTEMLIBS)
     target_include_directories( ll::fmodstudio SYSTEM INTERFACE ${LIBS_PREBUILT_DIR}/include/fmodstudio)
-    endif ()
   endif (FMODSTUDIO_LIBRARY AND FMODSTUDIO_INCLUDE_DIR)
 else()
   set( USE_FMODSTUDIO "OFF")
diff --git a/indra/cmake/GLH.cmake b/indra/cmake/GLH.cmake
index bdd8bc4836..648a08454b 100644
--- a/indra/cmake/GLH.cmake
+++ b/indra/cmake/GLH.cmake
@@ -2,11 +2,9 @@
 include(Prebuilt)
 
 add_library( ll::glh_linear INTERFACE IMPORTED )
+target_include_directories( ll::glh_linear SYSTEM INTERFACE ${LIBS_PREBUILT_DIR}/include)
 
-if (USESYSTEMLIBS)
-  target_include_directories( ll::glh_linear SYSTEM INTERFACE ${LIBS_PREBUILT_DIR}/include)
-  return ()
-endif ()
-
+if (NOT USESYSTEMLIBS)
 use_system_binary( glh_linear )
+endif (NOT USESYSTEMLIBS)
 use_prebuilt_binary(glh_linear)
diff --git a/indra/cmake/GLM.cmake b/indra/cmake/GLM.cmake
index 9cf410d9c3..451b7292cb 100644
--- a/indra/cmake/GLM.cmake
+++ b/indra/cmake/GLM.cmake
@@ -3,12 +3,12 @@ include(Prebuilt)
 
 add_library( ll::glm INTERFACE IMPORTED )
 
-if (USESYSTEMLIBS)
-  if (NOT LINUX)
-    find_package( glm REQUIRED )
-  endif ()
-  return ()
-else ()
+if (NOT USESYSTEMLIBS)
 use_system_binary( glm )
+elseif (NOT LINUX)
+  find_package( glm REQUIRED )
+endif (NOT USESYSTEMLIBS)
+
+if (LINUX OR USESYSTEMLIBS)
 use_prebuilt_binary(glm)
-endif ()
+endif (LINUX OR USESYSTEMLIBS)
diff --git a/indra/cmake/LLCoreHttp.cmake b/indra/cmake/LLCoreHttp.cmake
index 22ed5fef9c..5464e4d327 100644
--- a/indra/cmake/LLCoreHttp.cmake
+++ b/indra/cmake/LLCoreHttp.cmake
@@ -1,5 +1,5 @@
 # -*- cmake -*-
 
-include(CURL)
 include(OpenSSL)
+include(CURL)
 include(NGHTTP2)
diff --git a/indra/cmake/LibVLCPlugin.cmake b/indra/cmake/LibVLCPlugin.cmake
index 9f0419c5e6..779576a485 100644
--- a/indra/cmake/LibVLCPlugin.cmake
+++ b/indra/cmake/LibVLCPlugin.cmake
@@ -5,26 +5,56 @@ include(Prebuilt)
 include_guard()
 add_library( ll::libvlc INTERFACE IMPORTED )
 
-if (USE_AUTOBUILD_3P OR USE_CONAN)
-use_prebuilt_binary(vlc-bin)
-set(LIBVLCPLUGIN ON CACHE BOOL
-        "LIBVLCPLUGIN support for the llplugin/llmedia test apps.")
-else ()
+if (USESYSTEMLIBS)
     if (DARWIN)
+        if (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+            if (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/vlc_installed OR NOT ${vlc_installed} EQUAL 0)
+                if (NOT EXISTS ${CMAKE_BINARY_DIR}/vlc-3.0.21-arm64.dmg)
+                    file(DOWNLOAD
+                        https://get.videolan.org/vlc/3.0.21/macosx/vlc-3.0.21-arm64.dmg
+                        ${CMAKE_BINARY_DIR}/vlc-3.0.21-arm64.dmg
+                        )
+                endif (NOT EXISTS ${CMAKE_BINARY_DIR}/vlc-3.0.21-arm64.dmg)
+                file(WRITE ${PREBUILD_TRACKING_DIR}/vlc_installed "0")
+            endif (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/vlc_installed OR NOT ${vlc_installed} EQUAL 0)
+            execute_process(
+                COMMAND hdiutil attach -noverify vlc-3.0.21-arm64.dmg
+                WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+                )
+        else (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+            if (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/vlc_installed OR NOT ${vlc_installed} EQUAL 0)
+                if (NOT EXISTS ${CMAKE_BINARY_DIR}/vlc-3.0.21-intel64.dmg)
+                    file(DOWNLOAD
+                        https://get.videolan.org/vlc/3.0.21/macosx/vlc-3.0.21-intel64.dmg
+                        ${CMAKE_BINARY_DIR}/vlc-3.0.21-intel64.dmg
+                        )
+                endif (NOT EXISTS ${CMAKE_BINARY_DIR}/vlc-3.0.21-intel64.dmg)
+                file(WRITE ${PREBUILD_TRACKING_DIR}/vlc_installed "0")
+            endif (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/vlc_installed OR NOT ${vlc_installed} EQUAL 0)
+            execute_process(
+                COMMAND hdiutil attach -noverify vlc-3.0.21-intel64.dmg
+                WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+                )
+        endif (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
         target_include_directories( ll::libvlc SYSTEM INTERFACE /Volumes/VLC\ media\ player/VLC.app/Contents/MacOS/include)
         target_link_directories( ll::libvlc INTERFACE /Volumes/VLC\ media\ player/VLC.app/Contents/MacOS/lib)
         target_link_libraries( ll::libvlc INTERFACE vlc vlccore )
-    else ()
+    else (DARWIN)
         include(FindPkgConfig)
         pkg_check_modules(Libvlc REQUIRED libvlc vlc-plugin)
         target_include_directories( ll::libvlc SYSTEM INTERFACE ${Libvlc_INCLUDE_DIRS} )
         target_link_directories( ll::libvlc INTERFACE ${Libvlc_LIBRARY_DIRS} )
         target_link_libraries( ll::libvlc INTERFACE ${Libvlc_LIBRARIES} )
-    endif ()
+    endif (DARWIN)
     set(LIBVLCPLUGIN ON CACHE BOOL
             "LIBVLCPLUGIN support for the llplugin/llmedia test apps.")
     return()
-endif ()
+else (USESYSTEMLIBS)
+
+use_prebuilt_binary(vlc-bin)
+set(LIBVLCPLUGIN ON CACHE BOOL
+        "LIBVLCPLUGIN support for the llplugin/llmedia test apps.")
+endif (USESYSTEMLIBS)
 
 if (WINDOWS)
     target_link_libraries( ll::libvlc INTERFACE
diff --git a/indra/cmake/Meshoptimizer.cmake b/indra/cmake/Meshoptimizer.cmake
index a1cf81be80..0dc4069431 100644
--- a/indra/cmake/Meshoptimizer.cmake
+++ b/indra/cmake/Meshoptimizer.cmake
@@ -6,14 +6,66 @@ include(Prebuilt)
 include_guard()
 add_library( ll::meshoptimizer INTERFACE IMPORTED )
 
-if (NOT (USE_AUTOBUILD_3P OR USE_CONAN))
-  target_include_directories( ll::meshoptimizer SYSTEM INTERFACE ${CMAKE_SYSROOT}/usr/local/include )
-  target_link_libraries( ll::meshoptimizer INTERFACE meshoptimizer)
-  return ()
-endif ()
-
+if (NOT USESYSTEMLIBS)
 use_system_binary(meshoptimizer)
+else (NOT USESYSTEMLIBS)
+  if (NOT (${LINUX_DISTRO} MATCHES fedora OR (${LINUX_DISTRO} MATCHES opensuse-tumbleweed) OR DARWIN))
+    find_package(meshoptimizer)
+    target_link_libraries( ll::meshoptimizer INTERFACE meshoptimizer)
+  endif (NOT (${LINUX_DISTRO} MATCHES fedora OR (${LINUX_DISTRO} MATCHES opensuse-tumbleweed) OR DARWIN))
+endif (NOT USESYSTEMLIBS)
+
+if (${LINUX_DISTRO} MATCHES fedora OR (${LINUX_DISTRO} MATCHES opensuse-tumbleweed) OR DARWIN OR NOT USESYSTEMLIBS)
+  if (USESYSTEMLIBS)
+    if (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/meshoptimizer_installed OR NOT ${meshoptimizer_installed} EQUAL 0)
+      if (NOT EXISTS ${CMAKE_BINARY_DIR}/meshoptimizer-0.21.tar.gz)
+        file(DOWNLOAD
+          https://github.com/zeux/meshoptimizer/archive/refs/tags/v0.21.tar.gz
+          ${CMAKE_BINARY_DIR}/meshoptimizer-0.21.tar.gz
+          )
+      endif (NOT EXISTS ${CMAKE_BINARY_DIR}/meshoptimizer-0.21.tar.gz)
+      file(ARCHIVE_EXTRACT
+        INPUT ${CMAKE_BINARY_DIR}/meshoptimizer-0.21.tar.gz
+        DESTINATION ${CMAKE_BINARY_DIR}
+        )
+      if (DARWIN)
+        try_compile(MESHOPTIMIZER_RESULT
+          PROJECT meshoptimizer
+          SOURCE_DIR ${CMAKE_BINARY_DIR}/meshoptimizer-0.21
+          BINARY_DIR ${CMAKE_BINARY_DIR}/meshoptimizer-0.21
+          TARGET meshoptimizer
+          CMAKE_FLAGS
+            -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}
+            -DCMAKE_OSX_ARCHITECTURES:STRING=${CMAKE_OSX_ARCHITECTURES}
+            -DCMAKE_OSX_DEPLOYMENT_TARGET:STRING=10.15
+          OUTPUT_VARIABLE meshoptimizer_installed
+          )
+      else (DARWIN)
+        try_compile(MESHOPTIMIZER_RESULT
+          PROJECT meshoptimizer
+          SOURCE_DIR ${CMAKE_BINARY_DIR}/meshoptimizer-0.21
+          BINARY_DIR ${CMAKE_BINARY_DIR}/meshoptimizer-0.21
+          TARGET meshoptimizer
+          CMAKE_FLAGS
+            -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}
+          OUTPUT_VARIABLE meshoptimizer_installed
+          )
+      endif (DARWIN)
+      if (${MESHOPTIMIZER_RESULT})
+        file(
+          COPY ${CMAKE_BINARY_DIR}/meshoptimizer-0.21/src/meshoptimizer.h
+          DESTINATION ${LIBS_PREBUILT_DIR}/include/meshoptimizer
+          )
+        file(
+          COPY ${CMAKE_BINARY_DIR}/meshoptimizer-0.21/libmeshoptimizer.a
+          DESTINATION ${LIBS_PREBUILT_DIR}/lib/release
+          )
+        file(WRITE ${PREBUILD_TRACKING_DIR}/meshoptimizer_installed "0")
+      endif (${MESHOPTIMIZER_RESULT})
+    endif (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/meshoptimizer_installed OR NOT ${meshoptimizer_installed} EQUAL 0)
+  else (USESYSTEMLIBS)
 use_prebuilt_binary(meshoptimizer)
+  endif (USESYSTEMLIBS)
 
 if (WINDOWS)
   target_link_libraries( ll::meshoptimizer INTERFACE meshoptimizer.lib)
@@ -24,3 +76,4 @@ elseif (DARWIN)
 endif (WINDOWS)
 
 target_include_directories( ll::meshoptimizer SYSTEM INTERFACE ${LIBS_PREBUILT_DIR}/include/meshoptimizer)
+endif (${LINUX_DISTRO} MATCHES fedora OR (${LINUX_DISTRO} MATCHES opensuse-tumbleweed) OR DARWIN OR NOT USESYSTEMLIBS)
diff --git a/indra/cmake/Mikktspace.cmake b/indra/cmake/Mikktspace.cmake
index 9fd2becba4..c73321e313 100644
--- a/indra/cmake/Mikktspace.cmake
+++ b/indra/cmake/Mikktspace.cmake
@@ -1,6 +1,4 @@
 # -*- cmake -*-
 include(Prebuilt)
 
-if (NOT USESYSTEMLIBS)
   use_prebuilt_binary(mikktspace)
-endif (NOT USESYSTEMLIBS)
diff --git a/indra/cmake/NDOF.cmake b/indra/cmake/NDOF.cmake
index 326ef26c2c..1bf6c5086c 100644
--- a/indra/cmake/NDOF.cmake
+++ b/indra/cmake/NDOF.cmake
@@ -7,13 +7,47 @@ include_guard()
 add_library( ll::ndof INTERFACE IMPORTED )
 
 if (NDOF)
-  if (NOT USESYSTEMLIBS)
   if (WINDOWS OR DARWIN)
+  if (USESYSTEMLIBS)
+    if (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/libndofdev_installed OR NOT ${libndofdev_installed} EQUAL 0)
+      file(DOWNLOAD
+        https://github.com/secondlife/3p-libndofdev/archive/refs/tags/v0.1.8e9edc7.tar.gz
+        ${CMAKE_BINARY_DIR}/3p-libndofdev-0.1.8e9edc7.tar.gz
+        )
+      file(ARCHIVE_EXTRACT
+        INPUT ${CMAKE_BINARY_DIR}/3p-libndofdev-0.1.8e9edc7.tar.gz
+        DESTINATION ${CMAKE_BINARY_DIR}
+        )
+      try_compile(LIBNDOFDEV_RESULT
+        PROJECT libndofdev
+        SOURCE_DIR ${CMAKE_BINARY_DIR}/3p-libndofdev-0.1.8e9edc7/libndofdev
+        BINARY_DIR ${CMAKE_BINARY_DIR}/3p-libndofdev-0.1.8e9edc7/libndofdev
+        TARGET ndofdev
+        CMAKE_FLAGS
+          -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}
+          -DCMAKE_OSX_ARCHITECTURES:STRING=${CMAKE_OSX_ARCHITECTURES}
+          -DCMAKE_OSX_DEPLOYMENT_TARGET:STRING=10.15
+          -DCMAKE_C_FLAGS:STRING=-DTARGET_OS_MAC\ -Wno-int-conversion
+        OUTPUT_VARIABLE libndofdev_installed
+        )
+      if (${LIBNDOFDEV_RESULT})
+        file(
+          COPY ${CMAKE_BINARY_DIR}/3p-libndofdev-0.1.8e9edc7/libndofdev/src/ndofdev_external.h
+          DESTINATION ${LIBS_PREBUILT_DIR}/include
+          )
+        file(
+          COPY ${CMAKE_BINARY_DIR}/3p-libndofdev-0.1.8e9edc7/libndofdev/src/libndofdev.dylib
+          DESTINATION ${LIBS_PREBUILT_DIR}/lib/release
+          )
+        file(WRITE ${PREBUILD_TRACKING_DIR}/libndofdev_installed "0")
+      endif (${LIBNDOFDEV_RESULT})
+    endif (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/libndofdev_installed OR NOT ${libndofdev_installed} EQUAL 0)
+  else (USESYSTEMLIBS)
     use_prebuilt_binary(libndofdev)
+  endif (USESYSTEMLIBS)
   elseif (LINUX)
     use_prebuilt_binary(open-libndofdev)
   endif (WINDOWS OR DARWIN)
-  endif (NOT USESYSTEMLIBS)
 
   if (WINDOWS)
     target_link_libraries( ll::ndof INTERFACE libndofdev)
diff --git a/indra/cmake/OpenJPEG.cmake b/indra/cmake/OpenJPEG.cmake
index 6de03113ed..9bb222d8e8 100644
--- a/indra/cmake/OpenJPEG.cmake
+++ b/indra/cmake/OpenJPEG.cmake
@@ -6,15 +6,50 @@ add_library( ll::openjpeg INTERFACE IMPORTED )
 
 if (NOT USESYSTEMLIBS)
 use_system_binary(openjpeg)
-use_prebuilt_binary(openjpeg)
-elseif (NOT LINUX)
+elseif (${LINUX_DISTRO} MATCHES fedora OR (${LINUX_DISTRO} MATCHES opensuse-tumbleweed) OR DARWIN OR CMAKE_SYSTEM_NAME MATCHES FreeBSD)
   include(FindPkgConfig)
   pkg_check_modules(Openjpeg REQUIRED libopenjp2)
   target_include_directories(ll::openjpeg SYSTEM INTERFACE ${Openjpeg_INCLUDE_DIRS})
   target_link_directories(ll::openjpeg INTERFACE ${Openjpeg_LIBRARY_DIRS})
   target_link_libraries(ll::openjpeg INTERFACE ${Openjpeg_LIBRARIES})
-  return ()
 endif (NOT USESYSTEMLIBS)
+if (USESYSTEMLIBS AND (${LINUX_DISTRO} MATCHES fedora OR (${LINUX_DISTRO} MATCHES opensuse-tumbleweed) OR DARWIN OR CMAKE_SYSTEM_NAME MATCHES FreeBSD))
+  if (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/openjpeg_installed OR NOT ${openjpeg_installed} EQUAL 0)
+    if (NOT EXISTS ${CMAKE_BINARY_DIR}/openjpeg-2.5.2.tar.gz)
+      file(DOWNLOAD
+        https://github.com/uclouvain/openjpeg/archive/refs/tags/v2.5.2.tar.gz
+        ${CMAKE_BINARY_DIR}/openjpeg-2.5.2.tar.gz
+        )
+    endif (NOT EXISTS ${CMAKE_BINARY_DIR}/openjpeg-2.5.2.tar.gz)
+    file(ARCHIVE_EXTRACT
+      INPUT ${CMAKE_BINARY_DIR}/openjpeg-2.5.2.tar.gz
+      DESTINATION ${CMAKE_BINARY_DIR}
+      )
+    execute_process(
+      COMMAND cmake
+        -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}
+        .
+      WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/openjpeg-2.5.2
+      RESULT_VARIABLE openjpeg_installed
+      )
+    file(
+      COPY
+        ${CMAKE_BINARY_DIR}/openjpeg-2.5.2/src/lib/openjp2/cio.h
+        ${CMAKE_BINARY_DIR}/openjpeg-2.5.2/src/lib/openjp2/event.h
+        ${CMAKE_BINARY_DIR}/openjpeg-2.5.2/src/lib/openjp2/opj_config_private.h
+      DESTINATION ${LIBS_PREBUILT_DIR}/include/openjpeg-2.5
+      )
+    file(WRITE ${PREBUILD_TRACKING_DIR}/openjpeg_installed "${openjpeg_installed}")
+  endif (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/openjpeg_installed OR NOT ${openjpeg_installed} EQUAL 0)
+else (USESYSTEMLIBS AND (${LINUX_DISTRO} MATCHES fedora OR (${LINUX_DISTRO} MATCHES opensuse-tumbleweed) OR DARWIN OR CMAKE_SYSTEM_NAME MATCHES FreeBSD))
+use_prebuilt_binary(openjpeg)
+  if (NOT EXISTS ${LIBS_PREBUILT_DIR}/include/openjpeg-2.5)
+    file(RENAME
+      ${LIBS_PREBUILT_DIR}/include/openjpeg
+      ${LIBS_PREBUILT_DIR}/include/openjpeg-2.5
+      )
+  endif (NOT EXISTS ${LIBS_PREBUILT_DIR}/include/openjpeg-2.5)
 
 target_link_libraries(ll::openjpeg INTERFACE openjp2 )
+endif (USESYSTEMLIBS AND (${LINUX_DISTRO} MATCHES fedora OR (${LINUX_DISTRO} MATCHES opensuse-tumbleweed) OR DARWIN OR CMAKE_SYSTEM_NAME MATCHES FreeBSD))
 target_include_directories( ll::openjpeg SYSTEM INTERFACE ${LIBS_PREBUILT_DIR}/include)
diff --git a/indra/cmake/OpenSSL.cmake b/indra/cmake/OpenSSL.cmake
index 26508dc429..4481b3460f 100644
--- a/indra/cmake/OpenSSL.cmake
+++ b/indra/cmake/OpenSSL.cmake
@@ -4,8 +4,158 @@ include(Prebuilt)
 include_guard()
 add_library( ll::openssl INTERFACE IMPORTED )
 
-#use_system_binary(openssl)
-#use_prebuilt_binary(openssl)
+if (NOT USESYSTEMLIBS)
+use_system_binary(openssl)
+endif (NOT USESYSTEMLIBS)
+if (CMAKE_OSX_ARCHITECTURES MATCHES x86_64 OR LINUX OR NOT USESYSTEMLIBS)
+use_prebuilt_binary(openssl)
+elseif (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/openssl_installed OR NOT ${openssl_installed} EQUAL 0)
+  if (NOT EXISTS ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55.tar.gz)
+    file(DOWNLOAD
+      https://github.com/secondlife/3p-openssl/archive/refs/tags/v1.1.1q.de53f55.tar.gz
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55.tar.gz
+      )
+  endif (NOT EXISTS ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55.tar.gz)
+  file(ARCHIVE_EXTRACT
+    INPUT ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55.tar.gz
+    DESTINATION ${CMAKE_BINARY_DIR}
+    )
+  if (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+    set(ENV{CFLAGS} "-mmacosx-version-min=11.0")
+    execute_process(
+      COMMAND ./Configure no-shared darwin64-arm64-cc
+      WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl
+      )
+  else (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+    execute_process(
+      COMMAND ./config no-shared
+      WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl
+      )
+  endif (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+  execute_process(
+    COMMAND make -j${MAKE_JOBS}
+    WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl
+    RESULT_VARIABLE openssl_installed
+    )
+  if (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+    unset(ENV{CFLAGS})
+  endif (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+  file(
+    COPY
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/aes.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/bnerr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/conf_api.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/dtls1.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/evperr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/obj_mac.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/pkcs12.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/rsa.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/stack.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/x509.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/asn1.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/buffer.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/conferr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/e_os2.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/hmac.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/objects.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/pkcs12err.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/rsaerr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/store.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/x509_vfy.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/asn1_mac.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/buffererr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/crypto.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/ebcdic.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/idea.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/objectserr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/pkcs7.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/safestack.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/storeerr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/x509err.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/asn1err.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/camellia.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/cryptoerr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/ec.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/kdf.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/ocsp.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/pkcs7err.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/seed.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/symhacks.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/x509v3.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/asn1t.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/cast.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/ct.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/ecdh.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/kdferr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/ocsperr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/rand.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/sha.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/tls1.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/x509v3err.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/async.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/cmac.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/cterr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/ecdsa.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/lhash.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/opensslconf.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/rand_drbg.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/srp.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/ts.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/asyncerr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/cms.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/des.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/ecerr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/md2.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/opensslv.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/randerr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/srtp.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/tserr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/bio.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/cmserr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/dh.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/engine.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/md4.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/ossl_typ.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/rc2.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/ssl.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/txt_db.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/bioerr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/comp.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/dherr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/engineerr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/md5.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/pem.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/rc4.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/ssl2.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/ui.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/blowfish.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/comperr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/dsa.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/err.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/mdc2.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/pem2.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/rc5.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/ssl3.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/uierr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/bn.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/conf.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/dsaerr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/evp.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/modes.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/pemerr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/ripemd.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/sslerr.h
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/include/openssl/whrlpool.h
+    DESTINATION ${LIBS_PREBUILT_DIR}/include/openssl
+    )
+  file(
+    COPY
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/libcrypto.a
+      ${CMAKE_BINARY_DIR}/3p-openssl-1.1.1q.de53f55/openssl/libssl.a
+    DESTINATION ${LIBS_PREBUILT_DIR}/lib/release
+    )
+  file(WRITE ${PREBUILD_TRACKING_DIR}/openssl_installed "${openssl_installed}")
+endif (CMAKE_OSX_ARCHITECTURES MATCHES x86_64 OR LINUX OR NOT USESYSTEMLIBS)
 if (WINDOWS)
   target_link_libraries(ll::openssl INTERFACE libssl libcrypto)
 elseif (LINUX)
diff --git a/indra/cmake/Prebuilt.cmake b/indra/cmake/Prebuilt.cmake
index b0acae279b..c7b628d370 100644
--- a/indra/cmake/Prebuilt.cmake
+++ b/indra/cmake/Prebuilt.cmake
@@ -40,6 +40,38 @@ macro (use_prebuilt_binary _binary)
         --install-dir=${AUTOBUILD_INSTALL_DIR}
         ${_binary} ")
         endif(DEBUG_PREBUILT)
+        if(USESYSTEMLIBS)
+            execute_process(COMMAND xmllint
+                --xpath
+                "//map/map/map/map/map/map/string[contains(text(),'${_binary}')][contains(text(),'common')]/text()" autobuild.xml
+                WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/..
+                OUTPUT_VARIABLE package_url
+                OUTPUT_STRIP_TRAILING_WHITESPACE
+                )
+            if ("${package_url}" STREQUAL "")
+                string(TOLOWER ${CMAKE_SYSTEM_NAME} system_name)
+                if (${system_name} MATCHES freebsd)
+                    set(system_name "linux")
+                endif (${system_name} MATCHES freebsd)
+                execute_process(COMMAND xmllint
+                    --xpath
+                    "//map/map/map/map/map/map/string[contains(text(),'${_binary}')][contains(text(),'${system_name}64')]/text()" autobuild.xml
+                    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/..
+                    OUTPUT_VARIABLE package_url
+                    OUTPUT_STRIP_TRAILING_WHITESPACE
+                    )
+            endif ("${package_url}" STREQUAL "")
+            string(REGEX REPLACE ^https://github.com/secondlife/3p-${_binary}/releases/download/[vm][0-9]+.*/ "" package_name ${package_url})
+            file(DOWNLOAD
+                ${package_url}
+                ${CMAKE_BINARY_DIR}/${package_name}
+                )
+            file(ARCHIVE_EXTRACT
+                INPUT ${CMAKE_BINARY_DIR}/${package_name}
+                DESTINATION ${AUTOBUILD_INSTALL_DIR}
+                )
+            set(${_binary}_installed 0)
+        else(USESYSTEMLIBS)
         execute_process(COMMAND "${AUTOBUILD_EXECUTABLE}"
                 install
                 --install-dir=${AUTOBUILD_INSTALL_DIR}
@@ -47,6 +79,7 @@ macro (use_prebuilt_binary _binary)
                 WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
                 RESULT_VARIABLE ${_binary}_installed
                 )
+        endif(USESYSTEMLIBS)
         file(WRITE ${PREBUILD_TRACKING_DIR}/${_binary}_installed "${${_binary}_installed}")
     endif(${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/${_binary}_installed OR NOT ${${_binary}_installed} EQUAL 0)
 
diff --git a/indra/cmake/TinyEXR.cmake b/indra/cmake/TinyEXR.cmake
index 7500b774d8..e741c07f6e 100644
--- a/indra/cmake/TinyEXR.cmake
+++ b/indra/cmake/TinyEXR.cmake
@@ -1,9 +1,7 @@
 # -*- cmake -*-
 include(Prebuilt)
 
-if (NOT USESYSTEMLIBS)
 use_prebuilt_binary(tinyexr)
-endif ()
 
 set(TINYEXR_INCLUDE_DIR ${LIBS_PREBUILT_DIR}/include/tinyexr)
 
diff --git a/indra/cmake/TinyGLTF.cmake b/indra/cmake/TinyGLTF.cmake
index 7e74089208..92b2de309f 100644
--- a/indra/cmake/TinyGLTF.cmake
+++ b/indra/cmake/TinyGLTF.cmake
@@ -1,9 +1,7 @@
 # -*- cmake -*-
 include(Prebuilt)
 
-if (NOT USESYSTEMLIBS)
 use_prebuilt_binary(tinygltf)
-endif (NOT USESYSTEMLIBS)
 
 set(TINYGLTF_INCLUDE_DIR ${LIBS_PREBUILT_DIR}/include/tinygltf)
 
diff --git a/indra/cmake/UnixInstall.cmake b/indra/cmake/UnixInstall.cmake
index 59620b60b4..021700b374 100644
--- a/indra/cmake/UnixInstall.cmake
+++ b/indra/cmake/UnixInstall.cmake
@@ -6,64 +6,36 @@ set(INSTALL OFF CACHE BOOL
     "Generate install target.")
 
 if (INSTALL)
-
-  if (DARWIN)
-
-    set(INSTALL_PREFIX
-        ${viewer_BINARY_DIR}/${VIEWER_CHANNEL}.app/Contents
-        CACHE PATH
-        "Top-level installation directory.")
-
-    set(INSTALL_LIBRARY_DIR ${INSTALL_PREFIX}/Resources
-        CACHE PATH
-        "Installation directory for read-only shared files.")
-
-    set(INSTALL_SHARE_DIR ${INSTALL_LIBRARY_DIR} CACHE PATH
-        "Installation directory for read-only shared files.")
-
-    set(APP_BINARY_DIR ${INSTALL_PREFIX}/MacOS
-        CACHE PATH
-        "Installation directory for binaries.")
-
-    set(APP_SHARE_DIR ${INSTALL_SHARE_DIR}
-        CACHE PATH
-        "Installation directory for read-only data files.")
-
-    set(APP_LIBEXEC_DIR ${INSTALL_LIBRARY_DIR}
-        CACHE PATH
-        "Installation directory for non-manual executables.")
-
-  else (DARWIN)
-
-    set(INSTALL_PREFIX ${CMAKE_INSTALL_PREFIX} CACHE PATH
-        "Top-level installation directory.")
-
-    if (EXISTS ${CMAKE_SYSROOT}/usr/lib/${ARCH}-linux-gnu)
-      set(_LIB lib/${ARCH}-linux-gnu)
-    elseif (EXISTS /lib64)
-      set(_LIB lib64)
-    else ()
-      set(_LIB lib)
-    endif ()
-
-    set(INSTALL_LIBRARY_DIR ${INSTALL_PREFIX}/${_LIB} CACHE PATH
-        "Installation directory for read-only shared files.")
-
-    set(INSTALL_SHARE_DIR ${INSTALL_PREFIX}/share CACHE PATH
-        "Installation directory for read-only shared files.")
-
-    set(APP_BINARY_DIR ${INSTALL_PREFIX}/bin
-        CACHE PATH
-        "Installation directory for binaries.")
-
-    set(APP_SHARE_DIR ${INSTALL_SHARE_DIR}/${VIEWER_BINARY_NAME}
-        CACHE PATH
-        "Installation directory for read-only data files.")
-
-    set(APP_LIBEXEC_DIR ${INSTALL_PREFIX}/libexec/${VIEWER_BINARY_NAME}
-        CACHE PATH
-        "Installation directory for non-manual executables.")
-
-  endif (DARWIN)
-
+  if (CMAKE_SYSTEM_NAME MATCHES FreeBSD)
+      set(INSTALL_PREFIX ${CMAKE_INSTALL_PREFIX} CACHE PATH
+          "Top-level installation directory.")
+  else (CMAKE_SYSTEM_NAME MATCHES FreeBSD)
+  set(INSTALL_PREFIX /usr CACHE PATH
+      "Top-level installation directory.")
+  endif (CMAKE_SYSTEM_NAME MATCHES FreeBSD)
+
+  if (EXISTS /lib64)
+    set(_LIB lib64)
+  elseif (EXISTS ${CMAKE_SYSROOT}/usr/lib/${ARCH}-linux-gnu)
+    set(_LIB lib/${ARCH}-linux-gnu)
+  else (EXISTS /lib64)
+    set(_LIB lib)
+  endif (EXISTS /lib64)
+
+  set(INSTALL_LIBRARY_DIR ${INSTALL_PREFIX}/${_LIB} CACHE PATH
+      "Installation directory for read-only shared files.")
+
+  set(INSTALL_SHARE_DIR ${INSTALL_PREFIX}/share CACHE PATH
+      "Installation directory for read-only shared files.")
+
+  set(APP_BINARY_DIR ${INSTALL_LIBRARY_DIR}/secondlife-${viewer_VERSION}
+      CACHE PATH
+      "Installation directory for binaries.")
+
+  set(APP_SHARE_DIR ${INSTALL_SHARE_DIR}/${VIEWER_BINARY_NAME}
+      CACHE PATH
+      "Installation directory for read-only data files.")
+  set(APP_LIBEXEC_DIR ${INSTALL_PREFIX}/libexec/${VIEWER_BINARY_NAME}
+      CACHE PATH
+      "Installation directory for non-manual executables.")
 endif (INSTALL)
diff --git a/indra/cmake/Variables.cmake b/indra/cmake/Variables.cmake
index f746cdab78..c287f135fe 100644
--- a/indra/cmake/Variables.cmake
+++ b/indra/cmake/Variables.cmake
@@ -101,12 +101,15 @@ else (ADDRESS_SIZE EQUAL 32)
   endif()
 endif (ADDRESS_SIZE EQUAL 32)
 
+cmake_host_system_information(RESULT MAKE_JOBS QUERY NUMBER_OF_LOGICAL_CORES)
+
 if (${CMAKE_SYSTEM_NAME} MATCHES "Windows")
   set(WINDOWS ON BOOL FORCE)
 endif (${CMAKE_SYSTEM_NAME} MATCHES "Windows")
 
 if (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
   set(LINUX ON BOOl FORCE)
+  cmake_host_system_information(RESULT LINUX_DISTRO QUERY DISTRIB_ID)
 
   if (ADDRESS_SIZE EQUAL 32)
     set(DEB_ARCHITECTURE i386)
diff --git a/indra/cmake/ViewerMiscLibs.cmake b/indra/cmake/ViewerMiscLibs.cmake
index 7de21fd59b..4df54e2b59 100644
--- a/indra/cmake/ViewerMiscLibs.cmake
+++ b/indra/cmake/ViewerMiscLibs.cmake
@@ -1,24 +1,48 @@
 # -*- cmake -*-
 include(Prebuilt)
 
-if (NOT (USE_AUTOBUILD_3P OR USE_CONAN))
-  add_library( ll::fontconfig INTERFACE IMPORTED )
-  use_system_binary(fontconfig)
-endif ()
-
-if (LINUX)
+if (NOT DARWIN)
   add_library( ll::fontconfig INTERFACE IMPORTED )
 
   find_package(Fontconfig REQUIRED)
   target_link_libraries( ll::fontconfig INTERFACE  Fontconfig::Fontconfig )
-endif (LINUX)
+endif (NOT DARWIN)
 
-if( NOT USE_CONAN )
+if( USE_AUTOBUILD_3P )
   use_prebuilt_binary(libhunspell)
 endif()
 
+if (NOT USESYSTEMLIBS)
 use_prebuilt_binary(slvoice)
 
 use_prebuilt_binary(nanosvg)
+elseif (${LINUX_DISTRO} MATCHES debian OR DARWIN)
+  if (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/nanosvg_installed OR NOT ${nanosvg_installed} EQUAL 0)
+    if (DARWIN)
+      if (NOT EXISTS ${CMAKE_BINARY_DIR}/nanosvg-2022.09.27-darwin64-580364.tar.bz2)
+        file(DOWNLOAD
+          https://automated-builds-secondlife-com.s3.amazonaws.com/ct2/115452/994130/nanosvg-2022.09.27-darwin64-580364.tar.bz2
+          ${CMAKE_BINARY_DIR}/nanosvg-2022.09.27-darwin64-580364.tar.bz2
+          )
+      endif (NOT EXISTS ${CMAKE_BINARY_DIR}/nanosvg-2022.09.27-darwin64-580364.tar.bz2)
+      file(ARCHIVE_EXTRACT
+        INPUT ${CMAKE_BINARY_DIR}/nanosvg-2022.09.27-darwin64-580364.tar.bz2
+        DESTINATION ${LIBS_PREBUILT_DIR}
+        )
+    else (DARWIN)
+      if (NOT EXISTS ${CMAKE_BINARY_DIR}/nanosvg-2022.09.27-linux-580337.tar.bz2)
+        file(DOWNLOAD
+          https://automated-builds-secondlife-com.s3.amazonaws.com/ct2/115397/993664/nanosvg-2022.09.27-linux-580337.tar.bz2
+          ${CMAKE_BINARY_DIR}/nanosvg-2022.09.27-linux-580337.tar.bz2
+          )
+      endif (NOT EXISTS ${CMAKE_BINARY_DIR}/nanosvg-2022.09.27-linux-580337.tar.bz2)
+      file(ARCHIVE_EXTRACT
+        INPUT ${CMAKE_BINARY_DIR}/nanosvg-2022.09.27-linux-580337.tar.bz2
+        DESTINATION ${LIBS_PREBUILT_DIR}
+        )
+    endif (DARWIN)
+    file(WRITE ${PREBUILD_TRACKING_DIR}/nanosvg_installed "0")
+  endif (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/nanosvg_installed OR NOT ${nanosvg_installed} EQUAL 0)
+endif (NOT USESYSTEMLIBS)
 use_prebuilt_binary(viewer-fonts)
 use_prebuilt_binary(emoji_shortcodes)
diff --git a/indra/cmake/WebRTC.cmake b/indra/cmake/WebRTC.cmake
index 3120968560..fa8fa64ac0 100644
--- a/indra/cmake/WebRTC.cmake
+++ b/indra/cmake/WebRTC.cmake
@@ -6,9 +6,34 @@ include_guard()
 
 add_library( ll::webrtc INTERFACE IMPORTED )
 target_include_directories( ll::webrtc SYSTEM INTERFACE "${LIBS_PREBUILT_DIR}/include/webrtc" "${LIBS_PREBUILT_DIR}/include/webrtc/third_party/abseil-cpp")
-if (NOT USESYSTEMLIBS)
+if (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+    if (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/webrtc_installed OR NOT ${webrtc_installed} EQUAL 0)
+        if (NOT EXISTS ${CMAKE_BINARY_DIR}/libwebrtc-macos-arm64.tar.xz)
+            file(DOWNLOAD
+                https://github.com/crow-misia/libwebrtc-bin/releases/download/114.5735.6.1/libwebrtc-macos-arm64.tar.xz
+                ${CMAKE_BINARY_DIR}/libwebrtc-macos-arm64.tar.xz
+                SHOW_PROGRESS
+                )
+        endif (NOT EXISTS ${CMAKE_BINARY_DIR}/libwebrtc-macos-arm64.tar.xz)
+        file(ARCHIVE_EXTRACT
+            INPUT ${CMAKE_BINARY_DIR}/libwebrtc-macos-arm64.tar.xz
+            DESTINATION ${LIBS_PREBUILT_DIR}
+            )
+        file(RENAME
+          ${LIBS_PREBUILT_DIR}/lib/libwebrtc.a
+          ${LIBS_PREBUILT_DIR}/lib/release/libwebrtc.a
+          )
+        file(REMOVE_RECURSE ${LIBS_PREBUILT_DIR}/Frameworks/WebRTC.xcframework/macos-arm64/WebRTC.framework)
+        file(RENAME
+          ${LIBS_PREBUILT_DIR}/Frameworks/WebRTC.xcframework/macos-arm64/WebRTC.framework
+          ${LIBS_PREBUILT_DIR}/lib/release/WebRTC.framework
+          )
+        file(REMOVE_RECURSE ${LIBS_PREBUILT_DIR}/Frameworks)
+        file(WRITE ${PREBUILD_TRACKING_DIR}/webrtc_installed "0")
+    endif (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/webrtc_installed OR NOT ${webrtc_installed} EQUAL 0)
+elseif (NOT CMAKE_SYSTEM_NAME MATCHES FreeBSD)
 use_prebuilt_binary(webrtc)
-endif ()
+endif (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
 
 if (WINDOWS)
     target_link_libraries( ll::webrtc INTERFACE webrtc.lib )
diff --git a/indra/cmake/XmlRpcEpi.cmake b/indra/cmake/XmlRpcEpi.cmake
index 994df3d128..739648500c 100644
--- a/indra/cmake/XmlRpcEpi.cmake
+++ b/indra/cmake/XmlRpcEpi.cmake
@@ -4,20 +4,92 @@ include(Prebuilt)
 include_guard()
 add_library( ll::xmlrpc-epi INTERFACE IMPORTED )
 
-if (USE_AUTOBUILD_3P OR USE_CONAN)
+if (NOT USESYSTEMLIBS)
 use_system_binary( xmlrpc-epi )
 
 use_prebuilt_binary(xmlrpc-epi)
-endif ()
-
+elseif ((${LINUX_DISTRO} MATCHES opensuse-tumbleweed OR DARWIN) AND (${PREBUILD_TRACKING_DIR}/sentinel_installed IS_NEWER_THAN ${PREBUILD_TRACKING_DIR}/xmlrpc-epi_installed OR NOT ${xmlrpc-epi_installed} EQUAL 0))
+  if (NOT EXISTS ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2.tar.bz2)
+    file(DOWNLOAD
+      https://sourceforge.net/projects/xmlrpc-epi/files/xmlrpc-epi-base/0.54.2/xmlrpc-epi-0.54.2.tar.bz2
+      ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2.tar.bz2
+      )
+  endif (NOT EXISTS ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2.tar.bz2)
+  file(ARCHIVE_EXTRACT
+    INPUT ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2.tar.bz2
+    DESTINATION ${CMAKE_BINARY_DIR}
+    )
+  file(
+    COPY
+      ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2/src/base64.h
+      ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2/src/encodings.h
+      ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2/src/queue.h
+      ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2/src/simplestring.h
+      ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2/src/xml_element.h
+      ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2/src/xml_to_xmlrpc.h
+      ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2/src/xmlrpc.h
+      ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2/src/xmlrpc_introspection.h
+    DESTINATION ${LIBS_PREBUILT_DIR}/include/xmlrpc-epi
+    )
+  file(REMOVE
+    ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2/config.sub
+    ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2/missing
+    )
+  execute_process(
+    COMMAND autoreconf -is
+    WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2
+    )
+  set(ENV{CPPFLAGS} -I${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2/src)
+  if (DARWIN)
+    set(ENV{CFLAGS} "-arch ${CMAKE_OSX_ARCHITECTURES} -mmacosx-version-min=10.15")
+    if (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+      execute_process(
+        COMMAND sed -i '' -e "s/XMLRPC_VALUE find_named_value/__attribute__((always_inline)) XMLRPC_VALUE find_named_value/g"
+          xmlrpc_introspection.c
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2/src
+        )
+      execute_process(
+        COMMAND sed -i '' -e "s/void describe_method/__attribute__((always_inline)) void describe_method/g"
+          xmlrpc_introspection.c
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2/src
+        )
+      execute_process(
+        COMMAND ./configure --disable-static --host=aarch64-apple-darwin
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2
+        )
+    else (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+      execute_process(
+        COMMAND ./configure --disable-static --host=${CMAKE_OSX_ARCHITECTURES}-apple-darwin
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2
+        )
+    endif (CMAKE_OSX_ARCHITECTURES MATCHES arm64)
+    unset(ENV{CFLAGS})
+  else (DARWIN)
+    execute_process(
+      COMMAND ./configure --disable-shared
+      WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2
+      )
+  endif (DARWIN)
+  execute_process(
+    COMMAND make -j${MAKE_JOBS}
+    WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2
+    RESULT_VARIABLE xmlrpc-epi_installed
+    )
+  unset(ENV{CPPFLAGS})
+  file(
+    COPY
+      ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2/src/.libs/libxmlrpc-epi.dylib
+      ${CMAKE_BINARY_DIR}/xmlrpc-epi-0.54.2/src/.libs/libxmlrpc-epi.0.dylib
+    DESTINATION ${LIBS_PREBUILT_DIR}/lib/release
+    FOLLOW_SYMLINK_CHAIN
+    )
+  file(WRITE ${PREBUILD_TRACKING_DIR}/xmlrpc-epi_installed "${xmlrpc-epi_installed}")
+endif (NOT USESYSTEMLIBS)
 target_link_libraries(ll::xmlrpc-epi INTERFACE xmlrpc-epi )
-
-if (USE_AUTOBUILD_3P OR USE_CONAN)
+if (NOT USESYSTEMLIBS)
 target_include_directories( ll::xmlrpc-epi SYSTEM INTERFACE ${LIBS_PREBUILT_DIR}/include)
+elseif (${LINUX_DISTRO} MATCHES opensuse-tumbleweed OR DARWIN)
+  target_include_directories( ll::xmlrpc-epi SYSTEM INTERFACE ${LIBS_PREBUILT_DIR}/include/xmlrpc-epi)
 elseif (LINUX)
-	target_include_directories( ll::xmlrpc-epi SYSTEM INTERFACE
-		${CMAKE_SYSROOT}/usr/include/xmlrpc-epi)
-elseif (DARWIN)
-	target_include_directories( ll::xmlrpc-epi SYSTEM INTERFACE /usr/local/include)
-	target_link_directories( ll::xmlrpc-epi INTERFACE /usr/local/lib)
+  target_include_directories( ll::xmlrpc-epi SYSTEM INTERFACE ${CMAKE_SYSROOT}/usr/include/xmlrpc-epi)
 endif ()