Log Message:
Add patches/patch-main.c
to fix segmentation fault just after invocation, at least on
NetBSD/amd64 6.1, which is reported as PR pkg/47917.
The problem was also reported by gcc (4.5.3) as:
 main.c: In function 'main':
 main.c:206:15: warning: assignment makes pointer from integer without a cast
At following location:
   203                          char *simplified;
   ....
   206                          simplified = canonicalize_file_name(current_wd);