Index: lang/gcc/Makefile
===================================================================
--- lang/gcc/Makefile
+++ lang/gcc/Makefile
@@ -3,6 +3,7 @@
 
 PORTNAME=	gcc
 PORTVERSION=	4.8.5
+PORTREVISION=	1
 CATEGORIES=	lang java
 MASTER_SITES=	GCC/releases/gcc-${DISTVERSION}
 
@@ -46,9 +47,19 @@
 OPTIONS_DEFAULT_amd64=	JAVA
 OPTIONS_EXCLUDE_DragonFly=	JAVA
 BOOTSTRAP_DESC=		Build using a full bootstrap
+.if exists(/usr/lib32/libc.so)
+OPTIONS_DEFINE+=	MULTILIB
+OPTIONS_DEFAULT+=	MULTILIB
+.endif
+MULTILIB_DESC=		Build support for 32-bit and 64-bit target types
 
 .include <bsd.port.pre.mk>
 
+.if empty(PORT_OPTIONS:MMULTILIB)
+CONFIGURE_ENV+= 	enable_multilib=no
+CONFIGURE_ARGS+=	--disable-multilib
+.endif
+
 .if ${ARCH} == "amd64"
 CONFIGURE_TARGET=	x86_64-portbld-${OPSYS:tl}${OSREL}
 .else
Index: lang/gcc48/Makefile
===================================================================
--- lang/gcc48/Makefile
+++ 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}
@@ -49,9 +50,19 @@
 OPTIONS_DEFAULT_amd64=	JAVA
 OPTIONS_EXCLUDE_DragonFly=	JAVA
 BOOTSTRAP_DESC=		Build using a full bootstrap
+.if exists(/usr/lib32/libc.so)
+OPTIONS_DEFINE+=	MULTILIB
+OPTIONS_DEFAULT+=	MULTILIB
+.endif
+MULTILIB_DESC=		Build support for 32-bit and 64-bit target types
 
 .include <bsd.port.pre.mk>
 
+.if empty(PORT_OPTIONS:MMULTILIB)
+CONFIGURE_ENV+= 	enable_multilib=no
+CONFIGURE_ARGS+=	--disable-multilib
+.endif
+
 .if ${ARCH} == "amd64"
 CONFIGURE_TARGET=	x86_64-portbld-${OPSYS:tl}${OSREL}
 .else
Index: lang/gcc49/Makefile
===================================================================
--- lang/gcc49/Makefile
+++ lang/gcc49/Makefile
@@ -3,6 +3,7 @@
 
 PORTNAME=	gcc
 PORTVERSION=	4.9.4.s20151007
+PORTREVISION=	1
 CATEGORIES=	lang java
 MASTER_SITES=	GCC/snapshots/${DISTVERSION}
 PKGNAMESUFFIX=	${SUFFIX}
@@ -50,9 +51,19 @@
 OPTIONS_DEFAULT_amd64=	JAVA
 OPTIONS_EXCLUDE_DragonFly=	JAVA
 BOOTSTRAP_DESC=		Build using a full bootstrap
+.if exists(/usr/lib32/libc.so)
+OPTIONS_DEFINE+=	MULTILIB
+OPTIONS_DEFAULT+=	MULTILIB
+.endif
+MULTILIB_DESC=		Build support for 32-bit and 64-bit target types
 
 .include <bsd.port.pre.mk>
 
+.if empty(PORT_OPTIONS:MMULTILIB)
+CONFIGURE_ENV+= 	enable_multilib=no
+CONFIGURE_ARGS+=	--disable-multilib
+.endif
+
 .if ${ARCH} == "amd64"
 CONFIGURE_TARGET=	x86_64-portbld-${OPSYS:tl}${OSREL}
 .else