Index: head/lang/gcc/Makefile
===================================================================
--- head/lang/gcc/Makefile
+++ head/lang/gcc/Makefile
@@ -3,6 +3,7 @@
 
 PORTNAME=	gcc
 PORTVERSION=	4.8.5
+PORTREVISION=	1
 CATEGORIES=	lang java
 MASTER_SITES=	GCC/releases/gcc-${DISTVERSION}
 
@@ -47,6 +48,15 @@
 OPTIONS_EXCLUDE_DragonFly=	JAVA
 BOOTSTRAP_DESC=		Build using a full bootstrap
 
+.if exists(/usr/lib32/libc.so)
+OPTIONS_DEFINE_powerpc64=	MULTILIB
+OPTIONS_DEFAULT_powerpc64=	MULTILIB
+MULTILIB_DESC=		Build support for 32-bit and 64-bit target types
+MULTILIB_CONFIGURE_ENABLE=	multilib
+.else
+CONFIGURE_ARGS+=	--disable-multilib
+.endif
+
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} == "amd64"
Index: head/lang/gcc48/Makefile
===================================================================
--- head/lang/gcc48/Makefile
+++ head/lang/gcc48/Makefile
@@ -3,6 +3,7 @@
 
 PORTNAME=	gcc
 PORTVERSION=	4.8.5
+PORTREVISION=	1
 CATEGORIES=	lang java
 MASTER_SITES=	GCC/releases/gcc-${DISTVERSION}
 PKGNAMESUFFIX=	${SUFFIX}
@@ -50,6 +51,15 @@
 OPTIONS_EXCLUDE_DragonFly=	JAVA
 BOOTSTRAP_DESC=		Build using a full bootstrap
 
+.if exists(/usr/lib32/libc.so)
+OPTIONS_DEFINE_powerpc64=	MULTILIB
+OPTIONS_DEFAULT_powerpc64=	MULTILIB
+MULTILIB_DESC=		Build support for 32-bit and 64-bit target types
+MULTILIB_CONFIGURE_ENABLE=	multilib
+.else
+CONFIGURE_ARGS+=	--disable-multilib
+.endif
+
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} == "amd64"
Index: head/lang/gcc49/Makefile
===================================================================
--- head/lang/gcc49/Makefile
+++ head/lang/gcc49/Makefile
@@ -3,6 +3,7 @@
 
 PORTNAME=	gcc
 PORTVERSION=	4.9.4.s20151111
+PORTREVISION=	1
 CATEGORIES=	lang java
 MASTER_SITES=	GCC/snapshots/${DISTVERSION}
 PKGNAMESUFFIX=	${SUFFIX}
@@ -51,6 +52,15 @@
 OPTIONS_EXCLUDE_DragonFly=	JAVA
 BOOTSTRAP_DESC=		Build using a full bootstrap
 
+.if exists(/usr/lib32/libc.so)
+OPTIONS_DEFINE_powerpc64=	MULTILIB
+OPTIONS_DEFAULT_powerpc64=	MULTILIB
+MULTILIB_DESC=		Build support for 32-bit and 64-bit target types
+MULTILIB_CONFIGURE_ENABLE=	multilib
+.else
+CONFIGURE_ARGS+=	--disable-multilib
+.endif
+
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} == "amd64"
Index: head/lang/gcc5/Makefile
===================================================================
--- head/lang/gcc5/Makefile
+++ head/lang/gcc5/Makefile
@@ -3,7 +3,7 @@
 
 PORTNAME=	gcc
 PORTVERSION=	5.2.0
-PORTREVISION=	1
+PORTREVISION=	2
 CATEGORIES=	lang java
 MASTER_SITES=	GCC/releases/gcc-${DISTVERSION}
 PKGNAMESUFFIX=	${SUFFIX}
@@ -53,6 +53,15 @@
 BOOTSTRAP_DESC=		Build using a full bootstrap
 GRAPHITE_DESC=		Support for Graphite loop optimizations
 
+.if exists(/usr/lib32/libc.so)
+OPTIONS_DEFINE_powerpc64=	MULTILIB
+OPTIONS_DEFAULT_powerpc64=	MULTILIB
+MULTILIB_DESC=		Build support for 32-bit and 64-bit targets
+MULTILIB_CONFIGURE_ENABLE=	multilib
+.else
+CONFIGURE_ARGS+=	--disable-multilib
+.endif
+
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} == "amd64"