PAX won't make on my UNIX PC

[Kevin O'Gorman]

I just got PAX off the net and tried to make it on this here UNIX PC.  It
says right there in the README that it has been done, so I feel foolish
that I cannot do it.

cc complains that <limits.h> cannot be found.  I trace it down to 
./limits.h including <limits.h> whenever __STDC__ is defined.  I have
NO WAY that I can tell to undefine this symbol, and I cannot invent
this file.

Now what, folks.  The naming situation is tangled, I don't understand
that __STDC__ symbol, and I don't know what to do.

HELP!!