-extern int bn_limit_bits_high;
-extern int bn_limit_num_high; /* (1<<bn_limit_bits_high) */
-extern int bn_limit_bits_mont;
-extern int bn_limit_num_mont; /* (1<<bn_limit_bits_mont) */
+OPENSSL_EXTERN int bn_limit_bits_high;
+OPENSSL_EXTERN int bn_limit_num_high; /* (1<<bn_limit_bits_high) */
+OPENSSL_EXTERN int bn_limit_bits_mont;
+OPENSSL_EXTERN int bn_limit_num_mont; /* (1<<bn_limit_bits_mont) */