diff --git a/CMakeLists.txt b/CMakeLists.txt
index c27beec313d7..480f13e73c9f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -78,15 +78,17 @@ if(CLANG_BUILT_STANDALONE)
   if (NOT LLVM_CONFIG_FOUND)
     # Pull values from LLVMConfig.cmake.  We can drop this once the llvm-config
     # path is removed.
-    set(MAIN_INCLUDE_DIR "${LLVM_INCLUDE_DIR}")
+    set(INCLUDE_DIRS ${LLVM_INCLUDE_DIRS})
     set(LLVM_OBJ_DIR "${LLVM_BINARY_DIR}")
     # N.B. this is just a default value, the CACHE PATHs below can be overriden.
     set(MAIN_SRC_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../llvm")
     set(TOOLS_BINARY_DIR "${LLVM_TOOLS_BINARY_DIR}")
     set(LIBRARY_DIR "${LLVM_LIBRARY_DIR}")
+  else()
+    set(INCLUDE_DIRS "${LLVM_BINARY_DIR}/include" "${MAIN_INCLUDE_DIR}")
   endif()
 
-  set(LLVM_MAIN_INCLUDE_DIR "${MAIN_INCLUDE_DIR}" CACHE PATH "Path to llvm/include")
+  set(LLVM_INCLUDE_DIRS ${INCLUDE_DIRS} CACHE PATH "Path to llvm/include and any other header dirs needed")
   set(LLVM_BINARY_DIR "${LLVM_OBJ_ROOT}" CACHE PATH "Path to LLVM build tree")
   set(LLVM_MAIN_SRC_DIR "${MAIN_SRC_DIR}" CACHE PATH "Path to LLVM source tree")
   set(LLVM_TOOLS_BINARY_DIR "${TOOLS_BINARY_DIR}" CACHE PATH "Path to llvm/bin")
@@ -128,7 +130,7 @@ if(CLANG_BUILT_STANDALONE)
     set(LLVM_INCLUDE_TESTS ON)
   endif()
 
-  include_directories("${LLVM_BINARY_DIR}/include" "${LLVM_MAIN_INCLUDE_DIR}")
+  include_directories(${LLVM_INCLUDE_DIRS})
   link_directories("${LLVM_LIBRARY_DIR}")
 
   set( CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin )
diff --git a/cmake/modules/AddClang.cmake b/cmake/modules/AddClang.cmake
index 21ac332e4f5f..b16c314bd1e2 100644
--- a/cmake/modules/AddClang.cmake
+++ b/cmake/modules/AddClang.cmake
@@ -119,8 +119,8 @@ macro(add_clang_library name)
         install(TARGETS ${lib}
           COMPONENT ${lib}
           ${export_to_clangtargets}
-          LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
-          ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+          LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}"
+          ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}"
           RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
 
         if (NOT LLVM_ENABLE_IDE)
diff --git a/lib/Headers/CMakeLists.txt b/lib/Headers/CMakeLists.txt
index 6e2060991b92..b9bc930d26b8 100644
--- a/lib/Headers/CMakeLists.txt
+++ b/lib/Headers/CMakeLists.txt
@@ -420,7 +420,7 @@ add_header_target("openmp-resource-headers" ${openmp_wrapper_files})
 add_header_target("windows-resource-headers" ${windows_only_files})
 add_header_target("utility-resource-headers" ${utility_files})
 
-set(header_install_dir lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
+set(header_install_dir ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
 
 #############################################################
 # Install rules for the catch-all clang-resource-headers target
diff --git a/tools/libclang/CMakeLists.txt b/tools/libclang/CMakeLists.txt
index 8d95d0900e8c..ebc70ff7526d 100644
--- a/tools/libclang/CMakeLists.txt
+++ b/tools/libclang/CMakeLists.txt
@@ -180,7 +180,7 @@ 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 LLVM_ENABLE_IDE)
   add_custom_target(libclang-python-bindings)
diff --git a/tools/scan-build-py/CMakeLists.txt b/tools/scan-build-py/CMakeLists.txt
index 061dc7ef4dd9..adc54b2edc32 100644
--- a/tools/scan-build-py/CMakeLists.txt
+++ b/tools/scan-build-py/CMakeLists.txt
@@ -88,7 +88,7 @@ foreach(lib ${LibScanbuild})
                      DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/lib/libscanbuild/${lib})
   list(APPEND Depends ${CMAKE_BINARY_DIR}/lib/libscanbuild/${lib})
   install(PROGRAMS lib/libscanbuild/${lib}
-          DESTINATION lib/libscanbuild
+          DESTINATION "${CMAKE_INSTALL_LIBDIR}/libscanbuild"
           COMPONENT scan-build-py)
 endforeach()
 
@@ -106,7 +106,7 @@ foreach(resource ${LibScanbuildResources})
                      DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/lib/libscanbuild/resources/${resource})
   list(APPEND Depends ${CMAKE_BINARY_DIR}/lib/libscanbuild/resources/${resource})
   install(PROGRAMS lib/libscanbuild/resources/${resource}
-          DESTINATION lib/libscanbuild/resources
+          DESTINATION "${CMAKE_INSTALL_LIBDIR}/libscanbuild/resources"
           COMPONENT scan-build-py)
 endforeach()
 
@@ -122,7 +122,7 @@ foreach(lib ${LibEar})
                      DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/lib/libear/${lib})
   list(APPEND Depends ${CMAKE_BINARY_DIR}/lib/libear/${lib})
   install(PROGRAMS lib/libear/${lib}
-          DESTINATION lib/libear
+          DESTINATION "${CMAKE_INSTALL_LIBDIR}/libear"
           COMPONENT scan-build-py)
 endforeach()