[], [AC_MSG_ERROR([pthread is required])])
AC_CHECK_LIB([gnutls], [gnutls_certificate_verify_peers2],
[], [AC_MSG_ERROR([GnuTLS is required])])
[], [AC_MSG_ERROR([pthread is required])])
AC_CHECK_LIB([gnutls], [gnutls_certificate_verify_peers2],
[], [AC_MSG_ERROR([GnuTLS is required])])