diff --git a/CMakeLists.txt b/CMakeLists.txt
index c2016a45ca6b..9224797da0b5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,6 +9,8 @@ endif()
 if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
   project(Clang)
 
+  include(GNUInstallDirs)
+
   # Rely on llvm-config.
   set(CONFIG_OUTPUT)
   if(LLVM_CONFIG)
@@ -382,7 +384,7 @@ include_directories(BEFORE
 
 if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
   install(DIRECTORY include/clang include/clang-c
-    DESTINATION include
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
     FILES_MATCHING
     PATTERN "*.def"
     PATTERN "*.h"
@@ -391,7 +393,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
     )
 
   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/clang
-    DESTINATION include
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
     FILES_MATCHING
     PATTERN "CMakeFiles" EXCLUDE
     PATTERN "*.inc"
@@ -399,7 +401,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
     )
 
   install(PROGRAMS utils/bash-autocomplete.sh
-    DESTINATION share/clang
+    DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
     )
 endif()
 
diff --git a/cmake/modules/AddClang.cmake b/cmake/modules/AddClang.cmake
index 7e22f16f365b..3c0c1d245969 100644
--- a/cmake/modules/AddClang.cmake
+++ b/cmake/modules/AddClang.cmake
@@ -99,9 +99,9 @@ macro(add_clang_library name)
       install(TARGETS ${name}
         COMPONENT ${name}
         ${export_to_clangtargets}
-        LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
-        ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
-        RUNTIME DESTINATION bin)
+        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
+        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
+        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
 
       if (${ARG_SHARED} AND NOT CMAKE_CONFIGURATION_TYPES)
         add_llvm_install_targets(install-${name}
@@ -142,7 +142,7 @@ macro(add_clang_tool name)
 
     install(TARGETS ${name}
       ${export_to_clangtargets}
-      RUNTIME DESTINATION bin
+      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
       COMPONENT ${name})
 
     if(NOT CMAKE_CONFIGURATION_TYPES)
@@ -157,5 +157,5 @@ endmacro()
 macro(add_clang_symlink name dest)
   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
   # Always generate install targets
-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
+  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
 endmacro()
diff --git a/lib/Headers/CMakeLists.txt b/lib/Headers/CMakeLists.txt
index e444c9c8706f..f8e4d06366a4 100644
--- a/lib/Headers/CMakeLists.txt
+++ b/lib/Headers/CMakeLists.txt
@@ -164,19 +164,19 @@ install(
   FILES ${files} ${CMAKE_CURRENT_BINARY_DIR}/arm_neon.h
   COMPONENT clang-headers
   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
-  DESTINATION lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
+  DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
 
 install(
   FILES ${files} ${CMAKE_CURRENT_BINARY_DIR}/arm_fp16.h
   COMPONENT clang-headers
   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
-  DESTINATION lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
+  DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
 
 install(
   FILES ${cuda_wrapper_files}
   COMPONENT clang-headers
   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
-  DESTINATION lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include/cuda_wrappers)
+  DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include/cuda_wrappers)
 
 if (NOT CMAKE_CONFIGURATION_TYPES) # don't add this for IDE's.
   add_llvm_install_targets(install-clang-headers
diff --git a/tools/c-index-test/CMakeLists.txt b/tools/c-index-test/CMakeLists.txt
index 53e3421f1b35..79ae5bb4c399 100644
--- a/tools/c-index-test/CMakeLists.txt
+++ b/tools/c-index-test/CMakeLists.txt
@@ -54,7 +54,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
     set_property(TARGET c-index-test APPEND PROPERTY INSTALL_RPATH
        "@executable_path/../../lib")
   else()
-    set(INSTALL_DESTINATION bin)
+    set(INSTALL_DESTINATION ${CMAKE_INSTALL_BINDIR})
   endif()
 
   install(TARGETS c-index-test
diff --git a/tools/clang-check/CMakeLists.txt b/tools/clang-check/CMakeLists.txt
index b837b0a0a5d9..9e30bd5780a5 100644
--- a/tools/clang-check/CMakeLists.txt
+++ b/tools/clang-check/CMakeLists.txt
@@ -21,4 +21,4 @@ target_link_libraries(clang-check
   )
 
 install(TARGETS clang-check
-  RUNTIME DESTINATION bin)
+  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
diff --git a/tools/clang-extdef-mapping/CMakeLists.txt b/tools/clang-extdef-mapping/CMakeLists.txt
index 6c81689a831a..dacc14737719 100644
--- a/tools/clang-extdef-mapping/CMakeLists.txt
+++ b/tools/clang-extdef-mapping/CMakeLists.txt
@@ -18,4 +18,4 @@ target_link_libraries(clang-extdef-mapping
   )
 
 install(TARGETS clang-extdef-mapping
-  RUNTIME DESTINATION bin)
+  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
diff --git a/tools/clang-format/CMakeLists.txt b/tools/clang-format/CMakeLists.txt
index a295e8cd0b2a..1973ff82c7f6 100644
--- a/tools/clang-format/CMakeLists.txt
+++ b/tools/clang-format/CMakeLists.txt
@@ -21,20 +21,20 @@ if( LLVM_LIB_FUZZING_ENGINE OR LLVM_USE_SANITIZE_COVERAGE )
 endif()
 
 install(PROGRAMS clang-format-bbedit.applescript
-  DESTINATION share/clang
+  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
   COMPONENT clang-format)
 install(PROGRAMS clang-format-diff.py
-  DESTINATION share/clang
+  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
   COMPONENT clang-format)
 install(PROGRAMS clang-format-sublime.py
-  DESTINATION share/clang
+  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
   COMPONENT clang-format)
 install(PROGRAMS clang-format.el
-  DESTINATION share/clang
+  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
   COMPONENT clang-format)
 install(PROGRAMS clang-format.py
-  DESTINATION share/clang
+  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
   COMPONENT clang-format)
 install(PROGRAMS git-clang-format
-  DESTINATION bin
+  DESTINATION ${CMAKE_INSTALL_BINDIR}
   COMPONENT clang-format)
diff --git a/tools/clang-offload-bundler/CMakeLists.txt b/tools/clang-offload-bundler/CMakeLists.txt
index 8718015be76a..7a038f39622e 100644
--- a/tools/clang-offload-bundler/CMakeLists.txt
+++ b/tools/clang-offload-bundler/CMakeLists.txt
@@ -22,4 +22,4 @@ target_link_libraries(clang-offload-bundler
   ${CLANG_OFFLOAD_BUNDLER_LIB_DEPS}
   )
 
-install(TARGETS clang-offload-bundler RUNTIME DESTINATION bin)
+install(TARGETS clang-offload-bundler RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
diff --git a/tools/clang-rename/CMakeLists.txt b/tools/clang-rename/CMakeLists.txt
index 45cbd763425c..f534e022024a 100644
--- a/tools/clang-rename/CMakeLists.txt
+++ b/tools/clang-rename/CMakeLists.txt
@@ -19,8 +19,8 @@ target_link_libraries(clang-rename
   )
 
 install(PROGRAMS clang-rename.py
-  DESTINATION share/clang
+  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
   COMPONENT clang-rename)
 install(PROGRAMS clang-rename.el
-  DESTINATION share/clang
+  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
   COMPONENT clang-rename)
diff --git a/tools/diagtool/CMakeLists.txt b/tools/diagtool/CMakeLists.txt
index 96d1c390249c..41c762b37b76 100644
--- a/tools/diagtool/CMakeLists.txt
+++ b/tools/diagtool/CMakeLists.txt
@@ -21,7 +21,7 @@ target_link_libraries(diagtool
 if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
   install(TARGETS diagtool
     COMPONENT diagtool
-    RUNTIME DESTINATION bin)
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
 
   if (NOT CMAKE_CONFIGURATION_TYPES)
     add_llvm_install_targets(install-diagtool
diff --git a/tools/libclang/CMakeLists.txt b/tools/libclang/CMakeLists.txt
index 32333b011ad1..258dfb2d520c 100644
--- a/tools/libclang/CMakeLists.txt
+++ b/tools/libclang/CMakeLists.txt
@@ -131,7 +131,7 @@ endif()
 if(INTERNAL_INSTALL_PREFIX)
   set(LIBCLANG_HEADERS_INSTALL_DESTINATION "${INTERNAL_INSTALL_PREFIX}/include")
 else()
-  set(LIBCLANG_HEADERS_INSTALL_DESTINATION include)
+  set(LIBCLANG_HEADERS_INSTALL_DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 endif()
 
 install(DIRECTORY ../../include/clang-c
@@ -162,7 +162,7 @@ foreach(PythonVersion ${CLANG_PYTHON_BINDINGS_VERSIONS})
           COMPONENT
             libclang-python-bindings
           DESTINATION
-            "lib${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
+            "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
 endforeach()
 if(NOT CMAKE_CONFIGURATION_TYPES)
   add_custom_target(libclang-python-bindings)
diff --git a/tools/scan-build/CMakeLists.txt b/tools/scan-build/CMakeLists.txt
index 380379300b09..adfd58ed5f7d 100644
--- a/tools/scan-build/CMakeLists.txt
+++ b/tools/scan-build/CMakeLists.txt
@@ -41,7 +41,7 @@ if(CLANG_INSTALL_SCANBUILD)
                          ${CMAKE_BINARY_DIR}/bin/
                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
-    install(PROGRAMS bin/${BinFile} DESTINATION bin)
+    install(PROGRAMS bin/${BinFile} DESTINATION ${CMAKE_INSTALL_BINDIR})
   endforeach()
 
   foreach(LibexecFile ${LibexecFiles})
@@ -53,7 +53,7 @@ if(CLANG_INSTALL_SCANBUILD)
                          ${CMAKE_BINARY_DIR}/libexec/
                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/libexec/${LibexecFile})
     list(APPEND Depends ${CMAKE_BINARY_DIR}/libexec/${LibexecFile})
-    install(PROGRAMS libexec/${LibexecFile} DESTINATION libexec)
+    install(PROGRAMS libexec/${LibexecFile} DESTINATION ${CMAKE_INSTALL_LIBEXECDIR})
   endforeach()
 
   foreach(ManPage ${ManPages})
@@ -77,7 +77,7 @@ if(CLANG_INSTALL_SCANBUILD)
                          ${CMAKE_BINARY_DIR}/share/scan-build/
                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/scan-build/${ShareFile})
     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-build/${ShareFile})
-    install(FILES share/scan-build/${ShareFile} DESTINATION share/scan-build)
+    install(FILES share/scan-build/${ShareFile} DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-build)
   endforeach()
 
   add_custom_target(scan-build ALL DEPENDS ${Depends})
diff --git a/tools/scan-view/CMakeLists.txt b/tools/scan-view/CMakeLists.txt
index b305ca562a72..554bcb379061 100644
--- a/tools/scan-view/CMakeLists.txt
+++ b/tools/scan-view/CMakeLists.txt
@@ -21,7 +21,7 @@ if(CLANG_INSTALL_SCANVIEW)
                          ${CMAKE_BINARY_DIR}/bin/
                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
-    install(PROGRAMS bin/${BinFile} DESTINATION bin)
+    install(PROGRAMS bin/${BinFile} DESTINATION ${CMAKE_INSTALL_BINDIR})
   endforeach()
 
   foreach(ShareFile ${ShareFiles})
@@ -33,7 +33,7 @@ if(CLANG_INSTALL_SCANVIEW)
                          ${CMAKE_BINARY_DIR}/share/scan-view/
                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/${ShareFile})
     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-view/${ShareFile})
-    install(FILES share/${ShareFile} DESTINATION share/scan-view)
+    install(FILES share/${ShareFile} DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-view)
   endforeach()
 
   add_custom_target(scan-view ALL DEPENDS ${Depends})
diff --git a/utils/hmaptool/CMakeLists.txt b/utils/hmaptool/CMakeLists.txt
index 5573009d343a..24b3a90f233f 100644
--- a/utils/hmaptool/CMakeLists.txt
+++ b/utils/hmaptool/CMakeLists.txt
@@ -9,7 +9,7 @@ add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HM
                    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${CLANG_HMAPTOOL})
 
 list(APPEND Depends ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HMAPTOOL})
-install(PROGRAMS ${CLANG_HMAPTOOL} DESTINATION bin)
+install(PROGRAMS ${CLANG_HMAPTOOL} DESTINATION ${CMAKE_INSTALL_BINDIR})
 
 add_custom_target(hmaptool ALL DEPENDS ${Depends})
 set_target_properties(hmaptool PROPERTIES FOLDER "Utils")