--- include/openssl/bio.h.orig	2018-07-24 21:59:17.000000000 -0500
+++ include/openssl/bio.h	2018-11-07 18:44:43.000000000 -0600
@@ -713,6 +713,22 @@

 /*long BIO_ghbn_ctrl(int cmd,int iarg,char *parg);*/

+#ifdef __MINGW_PRINTF_FORMAT
+int
+BIO_printf(BIO *bio, const char *format, ...)
+	__attribute__((__format__(__MINGW_PRINTF_FORMAT, 2, 3), __nonnull__(2)));
+int
+BIO_vprintf(BIO *bio, const char *format, va_list args)
+	__attribute__((__format__(__MINGW_PRINTF_FORMAT, 2, 0), __nonnull__(2)));
+int
+BIO_snprintf(char *buf, size_t n, const char *format, ...)
+	__attribute__((__deprecated__, __format__(__MINGW_PRINTF_FORMAT, 3, 4),
+	    __nonnull__(3)));
+int
+BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
+	__attribute__((__deprecated__, __format__(__MINGW_PRINTF_FORMAT, 3, 0),
+	    __nonnull__(3)));
+#else
 int
 BIO_printf(BIO *bio, const char *format, ...)
 	__attribute__((__format__(__printf__, 2, 3), __nonnull__(2)));
@@ -727,6 +743,8 @@
 BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
 	__attribute__((__deprecated__, __format__(__printf__, 3, 0),
 	    __nonnull__(3)));
+#endif
+

 /* BEGIN ERROR CODES */
 /* The following lines are auto generated by the script mkerr.pl. Any changes