--- include/openssl/opensslfeatures.h.orig Fri Jul 28 06:04:42 2023 +++ include/openssl/opensslfeatures.h Fri Jul 28 06:09:00 2023 @@ -8,6 +8,13 @@ #define LIBRESSL_HAS_TLS1_3 #define LIBRESSL_HAS_DTLS1_2 +/* + * Used for compatibility with compilers lacking __attribute__ + */ +#if defined(_MSC_VER) && !defined(__clang__) && !defined(__attribute__) +#define __attribute__(a) +#endif + #define OPENSSL_THREADS #define OPENSSL_NO_BUF_FREELISTS