--- /dev/null
+#ifndef included_vat2_h
+#define included_vat2_h
+
+#include <stdbool.h>
+
+extern bool debug;
+
+#define DBG(fmt, args...) do {if (debug) fprintf(stderr, fmt, ## args); } while(0)
+#define ERR(fmt, args...) fprintf(stderr, "VAT2: %s:%d:%s(): " fmt, \
+ __FILE__, __LINE__, __func__, ##args)
+
+#endif