Libxml was added from CPM

src/cyb_error.h

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+/* -----------------------------------------------------------------------------
+ * The Cyberiada GraphML library implemention
+ *
+ * Error handling
+ *
+ * Copyright (C) 2024 Alexey Fedoseev <aleksey@fedoseev.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ * 
+ * This program 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see https://www.gnu.org/licenses/
+ *
+ * ----------------------------------------------------------------------------- */
+
+#ifndef __CYBERIADA_ERROR_H
+#define __CYBERIADA_ERROR_H
+
+#ifdef __DEBUG__
+#define DEBUG(...) fprintf(stderr, __VA_ARGS__)
+#else
+#define DEBUG(...)
+#endif
+
+#ifndef __SILENT__
+#define ERROR(...) fprintf(stderr, __VA_ARGS__)
+#else
+#define ERROR(...)
+#endif
+
+#endif