diff --git a/debug.h b/debug.h
new file mode 100644
index 00000000..6b9d1cb4
--- /dev/null
+++ b/debug.h
@@ -0,0 +1,39 @@
+/* Debugging macros and interface.
+Copyright (C) 1999 Free Software Foundation, Inc.
+This file is part of GNU Make.
+
+GNU Make 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 2, or (at your option)
+any later version.
+
+GNU Make 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 GNU Make; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+
+#define DB_NONE         (0x000)
+#define DB_BASIC        (0x001)
+#define DB_EXTRA        (0x002)
+#define DB_JOBS         (0x004)
+#define DB_IMPLICIT     (0x008)
+#define DB_MAKEFILES    (0x100)
+
+extern int db_level;
+
+#define ISDB(_l)    ((_l)&db_level)
+
+#define DBS(_l,_x)  do{ if(ISDB(_l)) {print_spaces (depth); \
+                                      printf _x; fflush (stdout);} }while(0)
+
+#define DBF(_l,_x)  do{ if(ISDB(_l)) {print_spaces (depth); \
+                                      printf (_x, file->name); \
+                                      fflush (stdout);} }while(0)
+
+#define DB(_l,_x)   do{ if(ISDB(_l)) {printf _x; fflush (stdout);} }while(0)