--- libgpg-error-1.12/src/mkerrcodes2.awk	2008-08-26 12:45:58.010747904 +0000
+++ libgpg-error-1.12-haiku/src/mkerrcodes2.awk	2012-04-09 16:59:18.363855872 +0000
@@ -81,7 +81,7 @@
 /^#/ { next; }
 
 header {
-  if ($1 ~ /^[0123456789]+$/)
+  if ($1 ~ /^-?[0123456789]+$/)
     {
       print "static const int err_code_from_index[] = {";
       header = 0;