Index: llvm/cmake/modules/CMakeLists.txt
===================================================================
--- llvm/cmake/modules/CMakeLists.txt
+++ llvm/cmake/modules/CMakeLists.txt
@@ -41,6 +41,12 @@
   "${LLVM_MAIN_INCLUDE_DIR}"
   "${LLVM_INCLUDE_DIR}"
   )
+set(LLVM_CONFIG_INCLUDE_DIR
+  "${LLVM_INCLUDE_DIR}"
+  )
+set(LLVM_CONFIG_MAIN_INCLUDE_DIR
+  "${LLVM_MAIN_INCLUDE_DIR}"
+  )
 set(LLVM_CONFIG_LIBRARY_DIRS
   "${LLVM_LIBRARY_DIR}"
   )
@@ -91,6 +97,8 @@
 get_filename_component(LLVM_INSTALL_PREFIX \"\${LLVM_INSTALL_PREFIX}\" PATH)")
 endforeach(p)
 set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/include")
+set(LLVM_CONFIG_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
+set(LLVM_CONFIG_MAIN_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
 set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/lib\${LLVM_LIBDIR_SUFFIX}")
 set(LLVM_CONFIG_CMAKE_DIR "\${LLVM_INSTALL_PREFIX}/${LLVM_INSTALL_PACKAGE_DIR}")
 set(LLVM_CONFIG_BINARY_DIR "\${LLVM_INSTALL_PREFIX}")
Index: llvm/cmake/modules/LLVMConfig.cmake.in
===================================================================
--- llvm/cmake/modules/LLVMConfig.cmake.in
+++ llvm/cmake/modules/LLVMConfig.cmake.in
@@ -67,10 +67,12 @@
 set(LLVM_INCLUDE_DIRS "@LLVM_CONFIG_INCLUDE_DIRS@")
 set(LLVM_LIBRARY_DIRS "@LLVM_CONFIG_LIBRARY_DIRS@")
 
-# These variables are duplicated, but they must match the LLVM variables of the
-# same name. The variables ending in "S" could some day become lists, and are
-# preserved for convention and compatibility.
-set(LLVM_INCLUDE_DIR "@LLVM_CONFIG_INCLUDE_DIRS@")
+# These variables are duplicated for install tree but they have different
+# values for build tree.  LLVM_INCLUDE_DIRS contains both source
+# and generated include directories while the following variables have
+# them split.
+set(LLVM_INCLUDE_DIR "@LLVM_CONFIG_INCLUDE_DIR@")
+set(LLVM_MAIN_INCLUDE_DIR "@LLVM_CONFIG_MAIN_INCLUDE_DIR@")
 set(LLVM_LIBRARY_DIR "@LLVM_CONFIG_LIBRARY_DIRS@")
 
 set(LLVM_DEFINITIONS "@LLVM_DEFINITIONS@")