https://bugs.gentoo.org/880399

--- a/ssl.c
+++ b/ssl.c
@@ -34,7 +34,7 @@
 static char* get_ssl_error();
 static SSL* get_ssl(struct vsf_session* p_sess, int fd);
 static int ssl_session_init(struct vsf_session* p_sess);
-static void setup_bio_callbacks();
+static void setup_bio_callbacks(SSL* p_ssl);
 static long bio_callback(
   BIO* p_bio, int oper, const char* p_arg, int argi, long argl, long retval);
 static int ssl_verify_callback(int verify_ok, X509_STORE_CTX* p_ctx);