Index: Makefile
===================================================================
--- Makefile	(revision 517364)
+++ Makefile	(working copy)
@@ -12,7 +12,8 @@
 LICENSE=	GPLv2+
 LICENSE_FILE=	${WRKSRC}/COPYING
 
-USES=		gettext gmake sdl shebangfix tar:bzip2
+USES=		compiler:c11 gettext gmake sdl shebangfix tar:bzip2
+#MAKE_JOBS_UNSAFE=	yes
 SHEBANG_FILES=	${WRKSRC}/menu/jumpnbump_menu.py.pre
 USE_SDL=	sdl2 mixer2 net2