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lexgrog.l is used to extract the whatis line(s) from manual pages.
The default lexgrog.c code is compiled from 2.4a lexgrog.l flex source
code as this is better at parsing HP-UX manual pages. For systems with
standardised manual pages: Linux, SunOS, there is little difference
between lexgrog.l-2.3.8 and lexgrog.l-2.4a, except the relative size of
the C code they produce, the later being larger.
In the event of poor whatis parsing or similar problems, simply
rm lexgrog.[lc]
ln -s lexgrog.l-2.3.8 lexgrog.l
and then re-make. You will need a version of flex >= 2.4.7 to compile
the flex file into C source.
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