diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -693,6 +693,10 @@
   "Build LLVM unit tests. If OFF, just generate build targets." OFF)
 option(LLVM_INCLUDE_TESTS "Generate build targets for the LLVM unit tests." ON)
 
+option(LLVM_INSTALL_GTEST
+  "Install the llvm gtest library.  This should be on if you want to do
+   stand-alone builds of the other projects and run their unit tests." OFF)
+
 option(LLVM_BUILD_BENCHMARKS "Add LLVM benchmark targets to the list of default
 targets. If OFF, benchmarks still could be built using Benchmarks target." OFF)
 option(LLVM_INCLUDE_BENCHMARKS "Generate benchmark targets. If OFF, benchmarks can't be built." ON)
diff --git a/third-party/unittest/CMakeLists.txt b/third-party/unittest/CMakeLists.txt
--- a/third-party/unittest/CMakeLists.txt
+++ b/third-party/unittest/CMakeLists.txt
@@ -65,12 +65,25 @@
 endif ()
 
 target_include_directories(llvm_gtest
-  PUBLIC googletest/include googlemock/include
+  PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/googletest/include>
+         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/googlemock/include>
+         $<INSTALL_INTERFACE:include/llvm-gtest/>
+         $<INSTALL_INTERFACE:include/llvm-gmock/>
   PRIVATE googletest googlemock
   )
 
 add_subdirectory(UnitTestMain)
 
+if (LLVM_INSTALL_GTEST)
+  export(TARGETS llvm_gtest llvm_gtest_main LLVMTestingSupport FILE LLVMGTestConfig.cmake)
+  install(TARGETS llvm_gtest llvm_gtest_main LLVMTestingSupport EXPORT LLVMGTestConfig
+	  ARCHIVE DESTINATION "lib${LLVM_LIBDIR_SUFFIX}" COMPONENT llvm_gtest)
+  install(EXPORT LLVMGTestConfig DESTINATION ${LLVM_INSTALL_PACKAGE_DIR} COMPONENT llvm_gtest)
+  add_llvm_install_targets(install-llvm_gtest COMPONENT llvm_gtest DEPENDS llvm_gtest LLVMGTestConfig.cmake)
+  install(DIRECTORY googletest/include/gtest/ DESTINATION include/llvm-gtest/gtest/ COMPONENT llvm_gtest)
+  install(DIRECTORY googlemock/include/gmock/ DESTINATION include/llvm-gmock/gmock/ COMPONENT llvm_gtest)
+endif()
+
 # When LLVM_LINK_LLVM_DYLIB is enabled, libLLVM.so is added to the interface
 # link libraries for gtest and gtest_main.  This means that any target, like
 # unittests for example, that links against gtest will be forced to link