Index: head/math/gfan/Makefile
===================================================================
--- head/math/gfan/Makefile	(revision 514541)
+++ head/math/gfan/Makefile	(revision 514542)
@@ -1,47 +1,50 @@
 # Created by: Lorenzo Salvadore
 # $FreeBSD$
 
 PORTNAME=	gfan
 DISTVERSION=	0.6.2
 PORTREVISION=	1
 CATEGORIES=	math
 MASTER_SITES=	http://home.math.au.dk/jensen/software/gfan/
 DISTNAME=	${PORTNAME}${DISTVERSION}
 
 MAINTAINER=	phascolarctos@protonmail.ch
 COMMENT=	Software for computing Groebner fans and tropical varieties
 
 LICENSE=	GPLv2+
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 LIB_DEPENDS=	libcddgmp.so:math/cddlib \
 		libgmp.so:math/gmp
 
 USES=		compiler:c++11-lang gmake localbase
 
 CFLAGS+=	-DGMPRATIONAL
 
 OPTIONS_DEFINE=	DOCS EXAMPLES
 
 post-patch:
 	@${REINPLACE_CMD} \
 		's,ADDITIONALLINKOPTIONS = ,ADDITIONALLINKOPTIONS = -L${LOCALBASE}/lib ,' \
 		${WRKSRC}/Makefile
+	for x in ${WRKSRC}/src/*; \
+		do ${REINPLACE_CMD} 's,log2,gfan_log2,g' $$x; \
+		done
 
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/gfan ${STAGEDIR}${PREFIX}/bin
 	cd ${STAGEDIR}${PREFIX}/bin && ./gfan installlinks
 
 post-install-DOCS-on:
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
 	${INSTALL_MAN} ${WRKSRC}/doc/manual.dvi ${STAGEDIR}${DOCSDIR}
 	${INSTALL_MAN} ${WRKSRC}/doc/*.eps ${STAGEDIR}${DOCSDIR}
 
 post-install-EXAMPLES-on:
 	@${MKDIR} ${STAGEDIR}${EXAMPLESDIR}
 	cd ${WRKSRC}/examples && ${COPYTREE_SHARE} . ${STAGEDIR}${EXAMPLESDIR}
 
 do-test:
 	cd ${WRKSRC} && ./gfan _test
 
 .include <bsd.port.mk>