+# We have to do this mangling using the shell, because words may contain
+# spaces and GNU make doesn't have any quoting interpretation.
+ifneq ($$(strip $$($1_$2_DEP_INCLUDE_DIRS)),)
+$1_$2_CC_INC_FLAGS:=$$(shell for i in $$($1_$2_DEP_INCLUDE_DIRS); do echo $$($1_$2_DEP_INCLUDE_DIRS_FLAG)\"$$$$i\"; done)
+endif
+