ssh: add a generic Curl_ssh_version function for SSH backends

Closes #4235

1 files changed, 6 insertions, 2 deletions

diff --git a/lib/ssh.h b/lib/ssh.h
index 96bb64099..3213c5a52 100644
--- a/lib/ssh.h
+++ b/lib/ssh.h
@@ -239,12 +239,16 @@ extern const struct Curl_handler Curl_handler_sftp;
 
 extern const struct Curl_handler Curl_handler_scp;
 extern const struct Curl_handler Curl_handler_sftp;
+#endif /* USE_LIBSSH2 */
 
+#ifdef USE_SSH
+/* generic SSH backend functions */
 CURLcode Curl_ssh_init(void);
 void Curl_ssh_cleanup(void);
-
+size_t Curl_ssh_version(char *buffer, size_t buflen);
 #else
+/* for non-SSH builds */
 #define Curl_ssh_cleanup()
-#endif /* USE_LIBSSH2 */
+#endif
 
 #endif /* HEADER_CURL_SSH_H */