AC_CHECK_LIB([gnutls], [gnutls_certificate_verify_peers2])
if test "x$ac_cv_lib_gnutls_gnutls_certificate_verify_peers2" != xyes; then
AC_MSG_ERROR([GnuTLS is required])
AC_CHECK_LIB([gnutls], [gnutls_certificate_verify_peers2])
if test "x$ac_cv_lib_gnutls_gnutls_certificate_verify_peers2" != xyes; then
AC_MSG_ERROR([GnuTLS is required])