zisofs-tools sloppy option does not work

The sloppy option does not work as documented in the mkzftree man page.
Here is the patch I used to enable it.
diff --git a/mkzftree.c b/mkzftree.c
index 9c7b038..9a8bf7c 100644
--- a/mkzftree.c
+++ b/mkzftree.c
@@ -95,7 +95,7 @@
 const char *program;
 
 /* Long options */
-#define OPTSTRING "fz:up:xXC:lLFvqV:hw"
+#define OPTSTRING "fz:up:xXC:lLFvqV:hws"
 #ifdef HAVE_GETOPT_LONG
 const struct option long_options[] = {
   { "force",	             0,  0,  'f' },
@@ -113,6 +113,7 @@
   { "verbosity",             1,  0,  'V' },
   { "help",                  0,  0,  'h' },
   { "version",               0,  0,  'w' },
+  { "sloppy",               0,  0,  's' },
   { 0, 0, 0, 0 }
 };
 #define LO(X) X