#ifdef USE_GNUTLS
# include <gnutls/gnutls.h>
-# if GNUTLS_VERSION_NUMBER >= 0x30000
+# if GNUTLS_VERSION_NUMBER >= 0x030000
# define SIGN_GNUTLS
+# if GNUTLS_VERSION_NUMBER >= 0x030600
+# define SIGN_HAVE_ED25519
+# endif
# else
# define SIGN_GCRYPT
# endif