diff --git a/share/mk/bsd.own.mk b/share/mk/bsd.own.mk
index 48cce5cdd6c8..39cf72e362c3 100644
--- a/share/mk/bsd.own.mk
+++ b/share/mk/bsd.own.mk
@@ -431,7 +431,10 @@ __DEFAULT_NO_OPTIONS+=GCC GNUCXX
 # suppression when building the base system to catch bugs in our headers.
 # Eventually we'll want to start building the base system C++ code as C++11,
 # but not yet.
+_COMPVERSION!= ${CC} --version
+.if ${_COMPVERSION:Mclang}
 CXXFLAGS+=	-Wno-c++11-extensions
+.endif
 .else
 # If clang is not cc, then build gcc by default
 __DEFAULT_NO_OPTIONS+=CLANG_IS_CC