When trying to execute zilstat on the command line, I get:

1. zilstat
   bash: /usr/local/bin/zilstat: /usr/local/bin/ksh93: bad interpreter: No such file or directory

And indeed, there is no /usr/local/bin/ksh93. However, this is misleading (the ksh package can easily be installed) since zilstat depends on dtrace which is not available on Linux.