@deftypefun {int} {gnutls_x509_crt_set_tlsfeatures} (gnutls_x509_crt_t @var{crt}, gnutls_x509_tlsfeatures_t @var{features})
@var{crt}: A X.509 certificate

@var{features}: If the function succeeds, the
features will be added to the certificate.

This function will set the certificates
X.509 TLS extension from the given structure.

@strong{Returns:} On success, @code{GNUTLS_E_SUCCESS}  (0) is returned,
otherwise a negative error value.

@strong{Since:} 3.5.1
@end deftypefun