Index: devel/llvm35/Makefile
===================================================================
--- devel/llvm35/Makefile	(revision 371112)
+++ devel/llvm35/Makefile	(working copy)
@@ -85,6 +85,9 @@ CONFIGURE_ARGS+=--enable-experimental-targets=R600
 
 .include <bsd.port.options.mk>
 
+# keep in sync with /usr/src/lib/clang/clang.build.mk
+CONFIGURE_TARGET:=${ARCH:C/amd64/x86_64/:C/armv6hf/armv6/}-portbld-${OPSYS:tl}${OSREL}
+
 .if ${PORT_OPTIONS:MASSERTS}
 CONFIGURE_ARGS+=	--enable-assertions
 RELEASE_TYPE=		Release+Asserts
Index: lang/clang35/Makefile
===================================================================
--- lang/clang35/Makefile	(revision 371207)
+++ lang/clang35/Makefile	(working copy)
@@ -75,6 +75,9 @@ PORTDATA=	scanview.css \
 
 .include <bsd.port.options.mk>
 
+# keep in sync with /usr/src/lib/clang/clang.build.mk
+CONFIGURE_TARGET:=${ARCH:C/amd64/x86_64/:C/armv6hf/armv6/}-portbld-${OPSYS:tl}${OSREL}
+
 .if ${PORT_OPTIONS:MASSERTS}
 CONFIGURE_ARGS+=	--enable-assertions
 RELTYPE=		Release+Asserts