RE: --show-manpath option

[Andrew Fitzgibbon]

I think one must avoid assuming that *all* extra command-line
switches are a problem.  In this case, one option is to issue

makeinfo --help | sed -e '/INFOPATH=.*/p' -e 's/INFOPATH=//'

or some perl/awk/bashvars equivalent, with all the standard 
possibilities of error, and the cost of starting sed (significant
on cygwin).  Another is to use 

makeinfo --show-manpath

which has a guaranteed action.