Windows support by Ruben Van Boxem.

llvm-svn: 142235
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 073458b1ab5489dce6f2ec789889c377b690ccf4
diff --git a/include/cfenv b/include/cfenv
index cd86b88..dd7db37 100644
--- a/include/cfenv
+++ b/include/cfenv
@@ -56,7 +56,9 @@
 #include <__config>
 #include <fenv.h>
 
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
+#endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD