+# ------------------------------------------------------------------------------
+have_gnutls=no
+AC_ARG_ENABLE(gnutls, AS_HELP_STRING([--disable-gnutls], [disable gnutls support]))
+if test "x$enable_gnutls" != "xno"; then
+ PKG_CHECK_MODULES(GNUTLS, [gnutls >= 3.1.4],
+ [AC_DEFINE(HAVE_GNUTLS, 1, [Define if gnutls is available]) have_gnutls=yes], have_gnutls=no)
+ if test "x$have_gnutls" = xno -a "x$enable_gnutls" = xyes; then
+ AC_MSG_ERROR([*** gnutls support requested but libraries not found])
+ fi
+fi
+AM_CONDITIONAL(HAVE_GNUTLS, [test "$have_gnutls" = "yes"])
+