(from Turbolinux)

the length check is wrong:
- dest_dir is /usr/src/debug by default
- base_dir is $RPM_BUILD_DIR, which can be /RPM/BUILD

diff -p -up rpm-4.4.2.3-rc1/tools/debugedit.c.pix rpm-4.4.2.3-rc1/tools/debugedit.c
--- rpm-4.4.2.3-rc1/tools/debugedit.c.pix	2008-01-25 09:11:06.000000000 +0100
+++ rpm-4.4.2.3-rc1/tools/debugedit.c	2008-02-11 18:15:53.000000000 +0100
@@ -1468,11 +1468,6 @@ main (int argc, char *argv[])
 	  fprintf (stderr, "You must specify a base dir if you specify a dest dir\n");
 	  exit (1);
 	}
-      if (strlen (dest_dir) > strlen (base_dir))
-	{
-	  fprintf (stderr, "Only dest dir longer than base dir not supported\n");
-	  exit (1);
-	}
     }
 
   /* Make sure there are trailing slashes in dirs */