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-rw-r--r--lib/libc++/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/libc++/Makefile b/lib/libc++/Makefile
index 36471f055eb67..c4c626f8a04dd 100644
--- a/lib/libc++/Makefile
+++ b/lib/libc++/Makefile
@@ -63,7 +63,7 @@ cxxrt_${_S}: ${_LIBCXXRTDIR}/${_S} .NOMETA
.endfor
WARNS= 0
-CFLAGS+= -isystem ${HDRDIR} -isystem ${_LIBCXXRTDIR} -nostdinc++ -nostdlib -DLIBCXXRT
+CFLAGS+= -isystem ${HDRDIR} -isystem ${_LIBCXXRTDIR} -nostdinc++ -nostdlib -D_LIBCPP_BUILDING_LIBRARY -DLIBCXXRT
.if empty(CXXFLAGS:M-std=*)
CXXFLAGS+= -std=c++11
.endif