@@ -399,15 +399,10 @@
 
 AC_CHECK_FUNC(objc_autoreleasePoolPush, [], [
 	AC_SUBST(AUTORELEASE_M, "autorelease.m")
 ])
 
-AC_CHECK_FUNC(objc_enumerationMutation, [
-	AC_DEFINE(HAVE_OBJC_ENUMERATIONMUTATION, 1,
-		[Whether we have objc_enumerationMutation()])
-])
-
 case "$host_os" in
 	darwin*)
 		AC_SUBST(LDFLAGS_REEXPORT, ["-Wl,-reexport-lobjfw"])
 		AS_IF([test x"$objc_runtime" = x"Apple runtime"], [
 			AC_SUBST(REEXPORT_LIBOBJC, ["-Wl,-reexport-lobjc"])