diff --git a/include/clang/Config/config.h.cmake b/include/clang/Config/config.h.cmake
index 8500c13..bd5dc31 100644
--- a/include/clang/Config/config.h.cmake
+++ b/include/clang/Config/config.h.cmake
@@ -4,7 +4,7 @@
 /* Relative directory for resource files */
 #define CLANG_RESOURCE_DIR "${CLANG_RESOURCE_DIR}"
 
-/* Directory with the libstdc++ installation. */
+/* Directory where gcc is installed. */
 #define GCC_INSTALL_PREFIX "${GCC_INSTALL_PREFIX}"
 
 /* Directories clang will search for headers */
diff --git a/include/clang/Config/config.h.in b/include/clang/Config/config.h.in
index e2daaf1..3f5d503 100644
--- a/include/clang/Config/config.h.in
+++ b/include/clang/Config/config.h.in
@@ -9,17 +9,8 @@
 /* Relative directory for resource files */
 #undef CLANG_RESOURCE_DIR
 
-/* 32 bit multilib directory. */
-#undef CXX_INCLUDE_32BIT_DIR
-
-/* 64 bit multilib directory. */
-#undef CXX_INCLUDE_64BIT_DIR
-
-/* Arch the libstdc++ headers. */
-#undef CXX_INCLUDE_ARCH
-
-/* Directory with the libstdc++ headers. */
-#undef CXX_INCLUDE_ROOT
+/* Directory where gcc is installed. */
+#undef GCC_INSTALL_PREFIX
 
 /* Directories clang will search for headers */
 #undef C_INCLUDE_DIRS