diff --git a/Makefile.inc1 b/Makefile.inc1
index 88749723876..7899d9dea58 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -323,7 +323,8 @@ X${BINUTIL}?=	${CROSS_BINUTILS_PREFIX}${${BINUTIL}}
 X${BINUTIL}?=	${${BINUTIL}}
 .endif
 .endfor
-WMAKEENV+=	CC="${XCC} ${XFLAGS}" CXX="${XCXX} ${XFLAGS}" \
+WMAKEENV+=	CC="${XCC} ${XFLAGS}" CXX="${XCXX} ${XFLAGS} ${XXFLAGS}" \
+		DEPFLAGS="${DEPFLAGS}" \
 		CPP="${XCPP} ${XFLAGS}" \
 		AS="${XAS}" AR="${XAR}" LD="${XLD}" NM=${XNM} \
 		OBJDUMP=${XOBJDUMP} OBJCOPY="${XOBJCOPY}" \
@@ -351,6 +352,8 @@ TARGET_ABI=	gnueabi
 .endif
 .if defined(X_COMPILER_TYPE) && ${X_COMPILER_TYPE} == gcc
 XFLAGS+=	-isystem ${WORLDTMP}/usr/include -L${WORLDTMP}/usr/lib
+XXFLAGS+=	-I${WORLDTMP}/usr/include/c++/v1 -std=gnu++11 -L${WORLDTMP}/../lib/libc++
+DEPFLAGS+=	-I${WORLDTMP}/usr/include/c++/v1
 .else
 TARGET_ABI?=	unknown
 TARGET_TRIPLE?=	${TARGET_ARCH:C/amd64/x86_64/}-${TARGET_ABI}-freebsd11.0