nac3/llvm/gnu-install-dirs.patch

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 277d0fe54d7b..af69c8be8745 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -256,15 +256,21 @@ if (CMAKE_BUILD_TYPE AND
   message(FATAL_ERROR "Invalid value for CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
 endif()
 
+include(GNUInstallDirs)
+
 set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )
 
-set(LLVM_TOOLS_INSTALL_DIR "bin" CACHE STRING "Path for binary subdirectory (defaults to 'bin')")
+set(LLVM_TOOLS_INSTALL_DIR "${CMAKE_INSTALL_BINDIR}" CACHE STRING
+    "Path for binary subdirectory (defaults to 'bin')")
 mark_as_advanced(LLVM_TOOLS_INSTALL_DIR)
 
 set(LLVM_UTILS_INSTALL_DIR "${LLVM_TOOLS_INSTALL_DIR}" CACHE STRING
     "Path to install LLVM utilities (enabled by LLVM_INSTALL_UTILS=ON) (defaults to LLVM_TOOLS_INSTALL_DIR)")
 mark_as_advanced(LLVM_UTILS_INSTALL_DIR)
 
+set(LLVM_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/cmake/llvm" CACHE STRING
+	"Path for CMake subdirectory (defaults to lib/cmake/llvm)" )
+
 # They are used as destination of target generators.
 set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin)
 set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
@@ -567,9 +573,9 @@ option (LLVM_ENABLE_SPHINX "Use Sphinx to generate llvm documentation." OFF)
 option (LLVM_ENABLE_OCAMLDOC "Build OCaml bindings documentation." ON)
 option (LLVM_ENABLE_BINDINGS "Build bindings." ON)
 
-set(LLVM_INSTALL_DOXYGEN_HTML_DIR "share/doc/llvm/doxygen-html"
+set(LLVM_INSTALL_DOXYGEN_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html"
     CACHE STRING "Doxygen-generated HTML documentation install directory")
-set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "share/doc/llvm/ocaml-html"
+set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html"
     CACHE STRING "OCamldoc-generated HTML documentation install directory")
 
 option (LLVM_BUILD_EXTERNAL_COMPILER_RT
@@ -1027,7 +1033,7 @@ endif()
 
 if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
   install(DIRECTORY include/llvm include/llvm-c
-    DESTINATION include
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
     COMPONENT llvm-headers
     FILES_MATCHING
     PATTERN "*.def"
@@ -1038,7 +1044,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
     )
 
   install(DIRECTORY ${LLVM_INCLUDE_DIR}/llvm ${LLVM_INCLUDE_DIR}/llvm-c
-    DESTINATION include
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
     COMPONENT llvm-headers
     FILES_MATCHING
     PATTERN "*.def"
@@ -1052,13 +1058,13 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
 
   if (LLVM_INSTALL_MODULEMAPS)
     install(DIRECTORY include/llvm include/llvm-c
-            DESTINATION include
+            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
             COMPONENT llvm-headers
             FILES_MATCHING
             PATTERN "module.modulemap"
             )
     install(FILES include/llvm/module.install.modulemap
-            DESTINATION include/llvm
+            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm
             COMPONENT llvm-headers
             RENAME "module.extern.modulemap"
             )
diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
index 97c9980c7de3..409e8b615f75 100644
--- a/cmake/modules/AddLLVM.cmake
+++ b/cmake/modules/AddLLVM.cmake
@@ -804,9 +804,9 @@ macro(add_llvm_library name)
 
       install(TARGETS ${name}
               ${export_to_llvmexports}
-              LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
-              ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
-              RUNTIME DESTINATION bin COMPONENT ${name})
+              LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
+              ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
+              RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT ${name})
 
       if (NOT LLVM_ENABLE_IDE)
         add_llvm_install_targets(install-${name}
@@ -1022,7 +1022,7 @@ function(process_llvm_pass_plugins)
           "set(LLVM_STATIC_EXTENSIONS ${LLVM_STATIC_EXTENSIONS})")
       install(FILES
           ${llvm_cmake_builddir}/LLVMConfigExtensions.cmake
-          DESTINATION ${LLVM_INSTALL_PACKAGE_DIR}
+          DESTINATION ${LLVM_INSTALL_CMAKE_DIR}
           COMPONENT cmake-exports)
 
       set(ExtensionDef "${LLVM_BINARY_DIR}/include/llvm/Support/Extension.def")
@@ -1242,7 +1242,7 @@ macro(add_llvm_example name)
   endif()
   add_llvm_executable(${name} ${ARGN})
   if( LLVM_BUILD_EXAMPLES )
-    install(TARGETS ${name} RUNTIME DESTINATION examples)
+    install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
   endif()
   set_target_properties(${name} PROPERTIES FOLDER "Examples")
 endmacro(add_llvm_example name)
@@ -1854,7 +1854,7 @@ function(llvm_install_library_symlink name dest type)
   set(full_name ${CMAKE_${type}_LIBRARY_PREFIX}${name}${CMAKE_${type}_LIBRARY_SUFFIX})
   set(full_dest ${CMAKE_${type}_LIBRARY_PREFIX}${dest}${CMAKE_${type}_LIBRARY_SUFFIX})
 
-  set(output_dir lib${LLVM_LIBDIR_SUFFIX})
+  set(output_dir ${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
   if(WIN32 AND "${type}" STREQUAL "SHARED")
     set(output_dir bin)
   endif()
@@ -1871,7 +1871,7 @@ function(llvm_install_library_symlink name dest type)
   endif()
 endfunction()
 
-function(llvm_install_symlink name dest)
+function(llvm_install_symlink name dest output_dir)
   cmake_parse_arguments(ARG "ALWAYS_GENERATE" "COMPONENT" "" ${ARGN})
   foreach(path ${CMAKE_MODULE_PATH})
     if(EXISTS ${path}/LLVMInstallSymlink.cmake)
@@ -1894,7 +1894,7 @@ function(llvm_install_symlink name dest)
   set(full_dest ${dest}${CMAKE_EXECUTABLE_SUFFIX})
 
   install(SCRIPT ${INSTALL_SYMLINK}
-          CODE "install_symlink(${full_name} ${full_dest} ${LLVM_TOOLS_INSTALL_DIR})"
+          CODE "install_symlink(${full_name} ${full_dest} ${output_dir})"
           COMPONENT ${component})
 
   if (NOT LLVM_ENABLE_IDE AND NOT ARG_ALWAYS_GENERATE)
@@ -1977,7 +1977,8 @@ function(add_llvm_tool_symlink link_name target)
     endif()
 
     if ((TOOL_IS_TOOLCHAIN OR NOT LLVM_INSTALL_TOOLCHAIN_ONLY) AND LLVM_BUILD_TOOLS)
-      llvm_install_symlink(${link_name} ${target})
+      GNUInstallDirs_get_absolute_install_dir(output_dir LLVM_TOOLS_INSTALL_DIR)
+      llvm_install_symlink(${link_name} ${target} ${output_dir})
     endif()
   endif()
 endfunction()
@@ -2100,9 +2101,9 @@ function(llvm_setup_rpath name)
 
   if (APPLE)
     set(_install_name_dir INSTALL_NAME_DIR "@rpath")
-    set(_install_rpath "@loader_path/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+    set(_install_rpath "@loader_path/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
   elseif(UNIX)
-    set(_install_rpath "\$ORIGIN/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+    set(_install_rpath "\$ORIGIN/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
     if(${CMAKE_SYSTEM_NAME} MATCHES "(FreeBSD|DragonFly)")
       set_property(TARGET ${name} APPEND_STRING PROPERTY
                    LINK_FLAGS " -Wl,-z,origin ")
diff --git a/cmake/modules/AddOCaml.cmake b/cmake/modules/AddOCaml.cmake
index 554046b20edf..4d1ad980641e 100644
--- a/cmake/modules/AddOCaml.cmake
+++ b/cmake/modules/AddOCaml.cmake
@@ -144,9 +144,9 @@ function(add_ocaml_library name)
   endforeach()
 
   if( APPLE )
-    set(ocaml_rpath "@executable_path/../../../lib${LLVM_LIBDIR_SUFFIX}")
+    set(ocaml_rpath "@executable_path/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
   elseif( UNIX )
-    set(ocaml_rpath "\\$ORIGIN/../../../lib${LLVM_LIBDIR_SUFFIX}")
+    set(ocaml_rpath "\\$ORIGIN/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
   endif()
   list(APPEND ocaml_flags "-ldopt" "-Wl,-rpath,${ocaml_rpath}")
 
diff --git a/cmake/modules/AddSphinxTarget.cmake b/cmake/modules/AddSphinxTarget.cmake
index e80c3b5c1cac..482f6d715ef5 100644
--- a/cmake/modules/AddSphinxTarget.cmake
+++ b/cmake/modules/AddSphinxTarget.cmake
@@ -90,7 +90,7 @@ function (add_sphinx_target builder project)
         endif()
       elseif (builder STREQUAL html)
         string(TOUPPER "${project}" project_upper)
-        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "share/doc/${project}/html"
+        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/html"
             CACHE STRING "HTML documentation install directory for ${project}")
 
         # '/.' indicates: copy the contents of the directory directly into
diff --git a/cmake/modules/CMakeLists.txt b/cmake/modules/CMakeLists.txt
index 505dc9a29d70..36e6c63af3f4 100644
--- a/cmake/modules/CMakeLists.txt
+++ b/cmake/modules/CMakeLists.txt
@@ -1,4 +1,4 @@
-set(LLVM_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm)
+set(LLVM_INSTALL_PACKAGE_DIR ${LLVM_INSTALL_CMAKE_DIR} CACHE STRING "Path for CMake subdirectory (defaults to 'cmake/llvm')")
 set(llvm_cmake_builddir "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
 
 # First for users who use an installed LLVM, create the LLVMExports.cmake file.
@@ -107,13 +107,13 @@ foreach(p ${_count})
   set(LLVM_CONFIG_CODE "${LLVM_CONFIG_CODE}
 get_filename_component(LLVM_INSTALL_PREFIX \"\${LLVM_INSTALL_PREFIX}\" PATH)")
 endforeach(p)
-set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/include")
+set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
 set(LLVM_CONFIG_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
 set(LLVM_CONFIG_MAIN_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
-set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/lib\${LLVM_LIBDIR_SUFFIX}")
+set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}\${LLVM_LIBDIR_SUFFIX}")
 set(LLVM_CONFIG_CMAKE_DIR "\${LLVM_INSTALL_PREFIX}/${LLVM_INSTALL_PACKAGE_DIR}")
 set(LLVM_CONFIG_BINARY_DIR "\${LLVM_INSTALL_PREFIX}")
-set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/bin")
+set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}")
 
 # Generate a default location for lit
 if (LLVM_INSTALL_UTILS AND LLVM_BUILD_UTILS)
diff --git a/cmake/modules/LLVMInstallSymlink.cmake b/cmake/modules/LLVMInstallSymlink.cmake
index 09fed8085c23..aa79f192abf0 100644
--- a/cmake/modules/LLVMInstallSymlink.cmake
+++ b/cmake/modules/LLVMInstallSymlink.cmake
@@ -10,7 +10,7 @@ function(install_symlink name target outdir)
     set(LINK_OR_COPY copy)
   endif()
 
-  set(bindir "${DESTDIR}${CMAKE_INSTALL_PREFIX}/${outdir}/")
+  set(bindir "${DESTDIR}${outdir}/")
 
   message(STATUS "Creating ${name}")
 
diff --git a/docs/CMake.rst b/docs/CMake.rst
index bb821b417ad9..6a528f7c2ad3 100644
--- a/docs/CMake.rst
+++ b/docs/CMake.rst
@@ -196,7 +196,7 @@ CMake manual, or execute ``cmake --help-variable VARIABLE_NAME``.
 **LLVM_LIBDIR_SUFFIX**:STRING
   Extra suffix to append to the directory where libraries are to be
   installed. On a 64-bit architecture, one could use ``-DLLVM_LIBDIR_SUFFIX=64``
-  to install libraries to ``/usr/lib64``.
+  to install libraries to ``/usr/lib64``. See also ``CMAKE_INSTALL_LIBDIR``.
 
 **CMAKE_C_FLAGS**:STRING
   Extra flags to use when compiling C source files.
@@ -550,8 +550,8 @@ LLVM-specific variables
 
 **LLVM_INSTALL_DOXYGEN_HTML_DIR**:STRING
   The path to install Doxygen-generated HTML documentation to. This path can
-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
-  `share/doc/llvm/doxygen-html`.
+  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
+  `${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html`.
 
 **LLVM_ENABLE_SPHINX**:BOOL
   If specified, CMake will search for the ``sphinx-build`` executable and will make
@@ -582,13 +582,33 @@ LLVM-specific variables
 
 **LLVM_INSTALL_SPHINX_HTML_DIR**:STRING
   The path to install Sphinx-generated HTML documentation to. This path can
-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
-  `share/doc/llvm/html`.
+  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
+  `${CMAKE_INSTALL_DOCDIR}/${project}/html`.
 
 **LLVM_INSTALL_OCAMLDOC_HTML_DIR**:STRING
   The path to install OCamldoc-generated HTML documentation to. This path can
-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
-  `share/doc/llvm/ocaml-html`.
+  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
+  `${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html`.
+
+**CMAKE_INSTALL_BINDIR**:STRING
+  The path to install binary tools, relative to the ``CMAKE_INSTALL_PREFIX``.
+  Defaults to `bin`.
+
+**CMAKE_INSTALL_LIBDIR**:STRING
+  The path to install libraries, relative to the ``CMAKE_INSTALL_PREFIX``.
+  Defaults to `lib`.
+
+**CMAKE_INSTALL_INCLUDEDIR**:STRING
+  The path to install header files, relative to the ``CMAKE_INSTALL_PREFIX``.
+  Defaults to `include`.
+
+**CMAKE_INSTALL_DOCDIR**:STRING
+  The path to install documentation, relative to the ``CMAKE_INSTALL_PREFIX``.
+  Defaults to `share/doc`.
+
+**CMAKE_INSTALL_MANDIR**:STRING
+  The path to install manpage files, relative to the ``CMAKE_INSTALL_PREFIX``.
+  Defaults to `share/man`.
 
 **LLVM_CREATE_XCODE_TOOLCHAIN**:BOOL
   macOS Only: If enabled CMake will generate a target named
@@ -786,9 +806,11 @@ the ``cmake`` command or by setting it directly in ``ccmake`` or ``cmake-gui``).
 
 This file is available in two different locations.
 
-* ``<INSTALL_PREFIX>/lib/cmake/llvm/LLVMConfig.cmake`` where
-  ``<INSTALL_PREFIX>`` is the install prefix of an installed version of LLVM.
-  On Linux typically this is ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
+* ``<LLVM_INSTALL_PACKAGE_DIR>LLVMConfig.cmake`` where
+  ``<LLVM_INSTALL_PACKAGE_DIR>`` is the location where LLVM CMake modules are
+  installed as part of an installed version of LLVM. This is typically
+  ``cmake/llvm/`` within the lib directory. On Linux, this is typically
+  ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
 
 * ``<LLVM_BUILD_ROOT>/lib/cmake/llvm/LLVMConfig.cmake`` where
   ``<LLVM_BUILD_ROOT>`` is the root of the LLVM build tree. **Note: this is only
diff --git a/examples/Bye/CMakeLists.txt b/examples/Bye/CMakeLists.txt
index bb96edb4b4bf..678c22fb43c8 100644
--- a/examples/Bye/CMakeLists.txt
+++ b/examples/Bye/CMakeLists.txt
@@ -14,6 +14,6 @@ if (NOT WIN32)
     BUILDTREE_ONLY
    )
 
-  install(TARGETS ${name} RUNTIME DESTINATION examples)
+  install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
   set_target_properties(${name} PROPERTIES FOLDER "Examples")
 endif()
diff --git a/include/llvm/CMakeLists.txt b/include/llvm/CMakeLists.txt
index b46319f24fc8..2feabd1954e4 100644
--- a/include/llvm/CMakeLists.txt
+++ b/include/llvm/CMakeLists.txt
@@ -5,5 +5,5 @@ add_subdirectory(Frontend)
 # If we're doing an out-of-tree build, copy a module map for generated
 # header files into the build area.
 if (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
-  configure_file(module.modulemap.build module.modulemap COPYONLY)
+  configure_file(module.modulemap.build ${LLVM_INCLUDE_DIR}/module.modulemap COPYONLY)
 endif (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
diff --git a/tools/llvm-config/BuildVariables.inc.in b/tools/llvm-config/BuildVariables.inc.in
index ebe5b73a5c65..70c497be12f5 100644
--- a/tools/llvm-config/BuildVariables.inc.in
+++ b/tools/llvm-config/BuildVariables.inc.in
@@ -23,6 +23,10 @@
 #define LLVM_CXXFLAGS "@LLVM_CXXFLAGS@"
 #define LLVM_BUILDMODE "@LLVM_BUILDMODE@"
 #define LLVM_LIBDIR_SUFFIX "@LLVM_LIBDIR_SUFFIX@"
+#define LLVM_INSTALL_BINDIR "@CMAKE_INSTALL_BINDIR@"
+#define LLVM_INSTALL_LIBDIR "@CMAKE_INSTALL_LIBDIR@"
+#define LLVM_INSTALL_INCLUDEDIR "@CMAKE_INSTALL_INCLUDEDIR@"
+#define LLVM_INSTALL_CMAKEDIR "@LLVM_INSTALL_CMAKE_DIR@"
 #define LLVM_TARGETS_BUILT "@LLVM_TARGETS_BUILT@"
 #define LLVM_SYSTEM_LIBS "@LLVM_SYSTEM_LIBS@"
 #define LLVM_BUILD_SYSTEM "@LLVM_BUILD_SYSTEM@"
diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
index 1a2f04552d13..44fa7d3eec6b 100644
--- a/tools/llvm-config/llvm-config.cpp
+++ b/tools/llvm-config/llvm-config.cpp
@@ -357,12 +357,26 @@ int main(int argc, char **argv) {
         ("-I" + ActiveIncludeDir + " " + "-I" + ActiveObjRoot + "/include");
   } else {
     ActivePrefix = CurrentExecPrefix;
-    ActiveIncludeDir = ActivePrefix + "/include";
-    SmallString<256> path(StringRef(LLVM_TOOLS_INSTALL_DIR));
-    sys::fs::make_absolute(ActivePrefix, path);
-    ActiveBinDir = std::string(path.str());
-    ActiveLibDir = ActivePrefix + "/lib" + LLVM_LIBDIR_SUFFIX;
-    ActiveCMakeDir = ActiveLibDir + "/cmake/llvm";
+    {
+      SmallString<256> path(StringRef(LLVM_INSTALL_INCLUDEDIR));
+      sys::fs::make_absolute(ActivePrefix, path);
+      ActiveIncludeDir = std::string(path.str());
+    }
+    {
+      SmallString<256> path(StringRef(LLVM_INSTALL_BINDIR));
+      sys::fs::make_absolute(ActivePrefix, path);
+      ActiveBinDir = std::string(path.str());
+    }
+    {
+      SmallString<256> path(StringRef(LLVM_INSTALL_LIBDIR LLVM_LIBDIR_SUFFIX));
+      sys::fs::make_absolute(ActivePrefix, path);
+      ActiveLibDir = std::string(path.str());
+    }
+    {
+      SmallString<256> path(StringRef(LLVM_INSTALL_CMAKEDIR));
+      sys::fs::make_absolute(ActivePrefix, path);
+      ActiveCMakeDir = std::string(path.str());
+    }
     ActiveIncludeOption = "-I" + ActiveIncludeDir;
   }
 
diff --git a/tools/lto/CMakeLists.txt b/tools/lto/CMakeLists.txt
index 2963f97cad88..69d66c9c9ca1 100644
--- a/tools/lto/CMakeLists.txt
+++ b/tools/lto/CMakeLists.txt
@@ -25,7 +25,7 @@ add_llvm_library(LTO SHARED INSTALL_WITH_TOOLCHAIN ${SOURCES} DEPENDS
     intrinsics_gen)
 
 install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/lto.h
-  DESTINATION include/llvm-c
+  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
   COMPONENT LTO)
 
 if (APPLE)
diff --git a/tools/opt-viewer/CMakeLists.txt b/tools/opt-viewer/CMakeLists.txt
index ead73ec13a8f..250362021f17 100644
--- a/tools/opt-viewer/CMakeLists.txt
+++ b/tools/opt-viewer/CMakeLists.txt
@@ -8,7 +8,7 @@ set (files
 
 foreach (file ${files})
   install(PROGRAMS ${file}
-    DESTINATION share/opt-viewer
+    DESTINATION ${CMAKE_INSTALL_DATADIR}/opt-viewer
     COMPONENT opt-viewer)
 endforeach (file)
 
diff --git a/tools/remarks-shlib/CMakeLists.txt b/tools/remarks-shlib/CMakeLists.txt
index 865436247270..ce1daa62f6ab 100644
--- a/tools/remarks-shlib/CMakeLists.txt
+++ b/tools/remarks-shlib/CMakeLists.txt
@@ -19,7 +19,7 @@ if(LLVM_ENABLE_PIC)
   endif()
   
   install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/Remarks.h
-    DESTINATION include/llvm-c
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
     COMPONENT Remarks)
 
   if (APPLE)