diff -up llvm-3.8.0rc2.src/CMakeLists.txt.fixinc llvm-3.8.0rc2.src/CMakeLists.txt
--- llvm-3.8.0rc2.src/CMakeLists.txt.fixinc	2016-01-14 05:03:44.000000000 +1000
+++ llvm-3.8.0rc2.src/CMakeLists.txt	2016-02-26 10:21:44.477295728 +1000
@@ -192,6 +192,7 @@ else()
 endif()
 
 # Each of them corresponds to llvm-config's.
+#
 set(LLVM_TOOLS_BINARY_DIR ${LLVM_RUNTIME_OUTPUT_INTDIR}) # --bindir
 set(LLVM_LIBRARY_DIR      ${LLVM_LIBRARY_OUTPUT_INTDIR}) # --libdir
 set(LLVM_MAIN_SRC_DIR     ${CMAKE_CURRENT_SOURCE_DIR}  ) # --src-root
@@ -558,6 +559,11 @@ set( CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LL
 set( CMAKE_LIBRARY_OUTPUT_DIRECTORY ${LLVM_BINARY_DIR}/lib${LLVM_LIBDIR_SUFFIX} )
 set( CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LLVM_BINARY_DIR}/lib${LLVM_LIBDIR_SUFFIX} )
 
+if(INCLUDE_INSTALL_DIR)
+else()
+set(INCLUDE_INSTALL_DIR ${CMAKE_INSTALL_PREFIX}/include)
+endif()
+
 set(CMAKE_BUILD_WITH_INSTALL_RPATH ON)
 if (APPLE)
   set(CMAKE_INSTALL_NAME_DIR "@rpath")
@@ -728,7 +734,7 @@ add_subdirectory(cmake/modules)
 
 if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
   install(DIRECTORY include/llvm include/llvm-c
-    DESTINATION include
+    DESTINATION "${INCLUDE_INSTALL_DIR}"
     COMPONENT llvm-headers
     FILES_MATCHING
     PATTERN "*.def"
@@ -740,7 +746,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
     )
 
   install(DIRECTORY ${LLVM_INCLUDE_DIR}/llvm
-    DESTINATION include
+    DESTINATION "${INCLUDE_INSTALL_DIR}"
     COMPONENT llvm-headers
     FILES_MATCHING
     PATTERN "*.def"