diff -ruN fontconfig-2.13.0.orig/src/Makefile.am fontconfig-2.13.0/src/Makefile.am
--- fontconfig-2.13.0.orig/src/Makefile.am	2018-03-01 20:18:19.000000000 -0800
+++ fontconfig-2.13.0/src/Makefile.am	2018-07-30 18:30:12.846430300 -0700
@@ -116,7 +116,8 @@
 		/CUT_OUT_BEGIN/ { no_write=1; next; }; \
 		/CUT_OUT_END/ { no_write=0; next; }; \
 		{ if (!no_write) print; next; }; \
-	' - > $@.tmp && \
+	' | \
+	$(GREP) -v '^ *$$' > $@.tmp && \
 	mv -f $@.tmp fcobjshash.gperf && touch $@ || ( $(RM) $@.tmp && false )
 
 fcobjshash.h: Makefile fcobjshash.gperf