diff -upr p11-kit-98292d6bbc.old/common/compat.c p11-kit-98292d6bbc/common/compat.c
--- p11-kit-98292d6bbc.old/common/compat.c	2014-03-26 05:06:34 +0000
+++ p11-kit-98292d6bbc/common/compat.c	2014-03-26 05:04:47 +0000
@@ -840,7 +840,17 @@ strerror_r (int errnum,
             size_t buflen)
 {
 #ifdef OS_WIN32
+	#ifdef __MINGW32__
+	char *str = strerror (errnum);
+	if (!str) {
+		*buf = 0;
+		return EINVAL;
+	}
+	strncpy (buf, str, buflen);
+	return 0;
+	#else
 	return strerror_s (buf, buflen, errnum);
+	#endif
 #else
 	#error no strerror_r implementation
 #endif