Index: Makefile
===================================================================
--- Makefile	(revision 499546)
+++ Makefile	(working copy)
@@ -18,7 +18,7 @@
 PORTSCOUT=	skipv:0.194
 
 USE_PYTHON=	autoplist concurrent distutils
-USES=		localbase python
+USES=		compiler:c11 localbase python
 
 post-patch:
 	@${REINPLACE_CMD} -e 's|%%LOCALBASE%%|${LOCALBASE}|' ${WRKSRC}/setup.py