Missing #ifdef around code used only with OpenSSL
diff --git a/test/srtp_driver.c b/test/srtp_driver.c
index ac5761c..1cd7f76 100644
--- a/test/srtp_driver.c
+++ b/test/srtp_driver.c
@@ -63,8 +63,10 @@
 srtp_err_status_t
 srtp_validate(void);
 
+#ifdef OPENSSL
 srtp_err_status_t
 srtp_validate_gcm(void);
+#endif
 
 srtp_err_status_t
 srtp_validate_encrypted_extensions_headers(void);