--- portage/dev-perl/Ace/Ace-1.920.0-r2.ebuild	2017-10-13 00:30:57.000000000 -0400
+++ local/portage/dev-perl/Ace/Ace-1.920.0-r2.ebuild	2017-11-10 17:53:31.000000000 -0500
@@ -23,6 +23,14 @@
 
 src_prepare() {
 	sed -i 's/", "1")/", "3")/' "${S}/Makefile.PL" || die "Can't patch config"
+	cat > "${S}/acelib/wmake/DARWIN_DEF" <<EOF
+NAME = DARWIN
+COMPILER = clang -fwritable-strings -DACEDB4 -DPOSIX
+LINKER = clang
+
+LIBS = -lm
+
+EOF
 	perl-module_src_prepare
 }
 src_test() {