+/* -*-comment-start: "//";comment-end:""-*-
+ * Mes --- Maxwell Equations of Software
+ * Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of Mes.
+ *
+ * Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Mes. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libmes.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+int
+main ()
+{
+ eputs ("setenv\n");
+ setenv ("FOO", "BAR", 1);
+ if (strcmp (getenv ("FOO"), "BAR"))
+ return 1;
+ eputs ("unsetenv\n");
+ unsetenv ("FOO");
+ if (getenv ("FOO"))
+ return 2;
+
+ return 0;
+}