---- a/ccache.c
-+++ b/ccache.c
-@@ -1803,6 +1803,7 @@ calculate_object_hash(struct args *args,
+--- a/src/ccache.c
++++ b/src/ccache.c
+@@ -1859,6 +1859,7 @@ calculate_object_hash(struct args *args,
"CPLUS_INCLUDE_PATH",
"OBJC_INCLUDE_PATH",
"OBJCPLUS_INCLUDE_PATH", // clang