Detect BSD Libraries installed in OSX?

[RGould8 at aol.com]

Is there a way to detect if the BSD libraries have been installed on a user's 
Mac OS X system?   From my understanding, the default OS X install comes with 
the BSD libraries, however, if the user for some reason has opted to disable 
them, certain unix calls I've been using fail in Revolution, like the "grep" 
command.   I suppose I could do a test to see if the grep command gives an 
error, but wonder if there's a better way.
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