@@ -429,10 +429,16 @@
 ])
 
 AC_CHECK_FUNC(madvise, [
 	AC_DEFINE(HAVE_MADVISE, 1, [Whether we have madvise])
 ])
+
+AS_IF([test x"$objc_runtime" = x"Apple"], [
+	AC_CHECK_HEADER(Foundation/Foundation.h, [
+		AC_SUBST(FOUNDATION_COMPAT_M, "foundation-compat.m")
+	])
+])
 
 AS_IF([test x"$GOBJC" = x"yes"], [
 	OBJCFLAGS="$OBJCFLAGS -Werror"
 
 	AC_MSG_CHECKING(whether gcc has bug objc/27438)