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-rw-r--r--configure.ac2
1 files changed, 1 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index 56b798644f9f..c2f9a22a7892 100644
--- a/configure.ac
+++ b/configure.ac
@@ -6413,7 +6413,7 @@ AC_LANG_PUSH([C++])
save_CXXFLAGS=$CXXFLAGS
CXXFLAGS="$CXXFLAGS $CXXFLAGS_CXX11"
dnl Unknown attributes must be ignored by compilers, but they do emit warnings about them:
-if test "$_os" = WINNT; then
+if test "$COM" = MSC; then
CXXFLAGS="$CXXFLAGS /WX"
else
CXXFLAGS="$CXXFLAGS -Werror"