--- a/src/mup/Makefile.am
+++ b/src/mup/Makefile.am
@@ -39 +39 @@ fontdata.c:	prolog.ps ../../tools/mup/getfontinfo.ps ../../LICENSE
-	$(GS) -sDEVICE=nullpage -sOutputFile=/dev/null -dQUIET - < ../../tools/mup/getfontinfo.ps | $(SED) -e "/Warning:/d" >> fontdata.c
+	$(GS) -sDEVICE=nullpage -sOutputFile=/dev/null -dQUIET --permit-file-write=charnames:fontinit - < ../../tools/mup/getfontinfo.ps | $(SED) -e "/Warning:/d" >> fontdata.c