Index: head/print/indexinfo/Makefile
===================================================================
--- head/print/indexinfo/Makefile	(revision 452907)
+++ head/print/indexinfo/Makefile	(revision 452908)
@@ -1,22 +1,23 @@
 # $FreeBSD$
 
 PORTNAME=	indexinfo
 PORTVERSION=	0.3
 CATEGORIES=	print ports-mgmt
 
 MAINTAINER=	bapt@FreeBSD.org
 COMMENT=	Utility to regenerate the GNU info page index
 
 LICENSE=	BSD2CLAUSE
 LICENSE_FILE=	${WRKSRC}/COPYING
 
+USE_CSTD=	gnu99
 USE_GITHUB=	yes
 GH_ACCOUNT=	bapt
 INSTALL_TARGET=	install-strip
 PLIST_FILES=	bin/indexinfo
 
 .if exists(/usr/include/sys/capsicum.h)
 CFLAGS+=	-DHAVE_CAPSICUM
 .endif
 
 .include <bsd.port.mk>