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diff --git a/third_party/heimdal/lib/roken/versionsupport.h b/third_party/heimdal/lib/roken/versionsupport.h
new file mode 100644
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+++ b/third_party/heimdal/lib/roken/versionsupport.h
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2018-2019, AuriStor, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in
+ *   the documentation and/or other materials provided with the
+ *   distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef _VERSIONSUPPORT_H_
+#define _VERSIONSUPPORT_H_ 1
+
+/*
+ * IsWindowsVersionOrGreater() is provided by Windows SDK 8.1 or greater.
+ * As AuriStorFS supports building with SDK 7.0 and greater we must
+ * provide our own.  VerifyVersionInfoW() is present on Windows XP and
+ * later.
+ */
+
+#ifndef _WIN32_WINNT_WIN7
+#define _WIN32_WINNT_WIN7     0x0601
+#endif
+
+#ifndef _WIN32_WINNT_WIN8
+#define _WIN32_WINNT_WIN8     0x0602
+#endif
+
+#ifndef _WIN32_WINNT_WINBLUE
+#define _WIN32_WINNT_WINBLUE  0x0603
+#endif
+
+/* Based upon VersionHelpers.h */
+FORCEINLINE BOOL
+IsWindowsVersionOrGreater(WORD wMajorVersion,
+			  WORD wMinorVersion,
+			  WORD wServicePackMajor)
+{
+    OSVERSIONINFOEXW osvi;
+    DWORDLONG        dwlConditionMask = 0;
+
+    dwlConditionMask = VerSetConditionMask(dwlConditionMask,
+					   VER_MAJORVERSION,
+					   VER_GREATER_EQUAL);
+    dwlConditionMask = VerSetConditionMask(dwlConditionMask,
+					   VER_MINORVERSION,
+					   VER_GREATER_EQUAL);
+    dwlConditionMask = VerSetConditionMask(dwlConditionMask,
+					   VER_SERVICEPACKMAJOR,
+					   VER_GREATER_EQUAL);
+
+    memset(&osvi, 0, sizeof(OSVERSIONINFOEXW));
+    osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEXW);
+    osvi.dwMajorVersion = wMajorVersion;
+    osvi.dwMinorVersion = wMinorVersion;
+    osvi.wServicePackMajor = wServicePackMajor;
+
+    return VerifyVersionInfoW(&osvi,
+			      (VER_MAJORVERSION |
+			       VER_MINORVERSION |
+			       VER_SERVICEPACKMAJOR),
+			      dwlConditionMask);
+}
+
+FORCEINLINE BOOL
+IsWindowsXPOrGreater(VOID)
+{
+    return IsWindowsVersionOrGreater(HIBYTE(_WIN32_WINNT_WINXP),
+				     LOBYTE(_WIN32_WINNT_WINXP),
+				     0);
+}
+
+FORCEINLINE BOOL
+IsWindows7OrGreater(VOID)
+{
+    return IsWindowsVersionOrGreater(HIBYTE(_WIN32_WINNT_WIN7),
+				     LOBYTE(_WIN32_WINNT_WIN7),
+				     0);
+}
+
+FORCEINLINE BOOL
+IsWindows8OrGreater(VOID)
+{
+    return IsWindowsVersionOrGreater(HIBYTE(_WIN32_WINNT_WIN8),
+				     LOBYTE(_WIN32_WINNT_WIN8),
+				     0);
+}
+
+FORCEINLINE BOOL
+IsWindows8Point1OrGreater(VOID)
+{
+    return IsWindowsVersionOrGreater(HIBYTE(_WIN32_WINNT_WINBLUE),
+				     LOBYTE(_WIN32_WINNT_WINBLUE),
+				     0);
+}
+
+#define IS_WINDOWS_VERSION_OR_GREATER_CACHED(fn)		\
+								\
+FORCEINLINE BOOL						\
+fn##Cached(VOID)						\
+{								\
+    static LONG lIsVersionOrGreater = -1;			\
+								\
+    if (lIsVersionOrGreater == -1) {				\
+	LONG lResult = fn();					\
+	InterlockedCompareExchangeRelease(&lIsVersionOrGreater, \
+					  lResult, -1);		\
+    }								\
+								\
+    return lIsVersionOrGreater == 1;				\
+}
+
+IS_WINDOWS_VERSION_OR_GREATER_CACHED(IsWindowsXPOrGreater)
+IS_WINDOWS_VERSION_OR_GREATER_CACHED(IsWindows7OrGreater)
+IS_WINDOWS_VERSION_OR_GREATER_CACHED(IsWindows8OrGreater)
+IS_WINDOWS_VERSION_OR_GREATER_CACHED(IsWindows8Point1OrGreater)
+
+#endif /* _VERSIONSUPPORT_H_ */