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-rw-r--r--lib/Support/Windows/Windows.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Support/Windows/Windows.h b/lib/Support/Windows/Windows.h
index dfa4be3a15..4a1553b599 100644
--- a/lib/Support/Windows/Windows.h
+++ b/lib/Support/Windows/Windows.h
@@ -16,6 +16,9 @@
//=== is guaranteed to work on *all* Win32 variants.
//===----------------------------------------------------------------------===//
+// mingw-w64 tends to define it as 0x0502 in its headers.
+#undef _WIN32_WINNT
+
// Require at least Windows 2000 API.
#define _WIN32_WINNT 0x0500
#define _WIN32_IE 0x0500 // MinGW at it again.