diff --git a/include/picconf.h b/include/picconf.h
new file mode 100644
index 00000000..8ed33f66
--- /dev/null
+++ b/include/picconf.h
@@ -0,0 +1,13 @@
+#ifndef PICCONF_H__
+#define PICCONF_H__
+
+#define DEBUG 1
+
+#if DEBUG
+# define GC_DEBUG 1
+# define VM_DEBUG 1
+#endif
+
+
+#endif
+
diff --git a/include/picrin.h b/include/picrin.h
index 3435ee77..7e3a71a9 100644
--- a/include/picrin.h
+++ b/include/picrin.h
@@ -4,6 +4,7 @@
 #include <stddef.h>
 #include <stdbool.h>
 
+#include "picconf.h"
 #include "picrin/value.h"
 
 struct pic_env {