Index: head/x11/sessreg/Makefile
===================================================================
--- head/x11/sessreg/Makefile	(revision 382985)
+++ head/x11/sessreg/Makefile	(revision 382986)
@@ -1,15 +1,16 @@
 # $FreeBSD$
 
 PORTNAME=	sessreg
 PORTVERSION=	1.0.8
 CATEGORIES=	x11
 
 MAINTAINER=	x11@FreeBSD.org
 COMMENT=	Manage utmp/wtmp entries for non-init X clients
 
 XORG_CAT=	app
 USE_XORG=	x11
+CPP+=		-P	# Required for gcc5+
 
 PLIST_FILES=	bin/sessreg man/man1/sessreg.1.gz
 
 .include <bsd.port.mk>