Robert Lowe wrote:
> I have a small project that needs to install executables under
> /usr/local/<package>/, but the manpages under /usr/local/man.
> If I use AC_PREFIX_DEFAULT in configure.ac to point to
> /usr/local/<package>, how can I override it for manpages?
Hi Robert,
Just a simple `off the cuff' suggestion. A quick look in configure
shows that it initialises mandir as:
mandir='${prefix}/man'
*before* it parses the command line arguments, where that might be
overridden by a `--mandir=...' option. Thus, for one off use, you
could just inline the assignment:
mandir=`echo $mandir | sed s?^${prefix}?/usr/local?`
in your configure.ac. (Just after the AC_PREFIX_DEFAULT seems the
most logical place, but it doesn't really matter that much, as long
as it comes after AC_INIT, and before AC_OUTPUT).
For a slightly more polished, and reusable solution, you could use
something like:
# RL_AC_DEFAULT_OVERRIDE( VARNAME, PATHTAG, REPLACEMENT )
# Modify the default configure path specified by VARNAME, replacing
# PATHTAG with REPLACEMENT.
#
# e.g. RL_AC_DEFAULT_OVERRIDE([mandir],[^${prefix}],[/opt])
# will set the default mandir to /var/man, rather than its normal
# default setting of ${prefix}/man
#
AC_DEFUN([RL_AC_DEFAULT_OVERRIDE],
[ $1=`echo $[$1] | sed s'?$2?$3?'`
]) dnl RL_AC_DEFAULT_OVERRIDE
(which IMO belongs in aclocal.m4, but it's short enough to inline
in configure.ac, if you prefer).
Then, in configure.ac, after AC_PREFIX_DEFAULT, you could say:
RL_AC_DEFAULT_OVERRIDE([mandir],[^${prefix}],[/usr/local])
to achieve the effect you desire, while still leaving the user the
option to override this with `--mandir=...'.
The same macro could also be used to set an alternative default for,
say, `infodir':
RL_AC_DEFAULT_OVERRIDE([infodir],[^${prefix}],[/usr/local])
or any of the other default paths defined in terms of ${prefix},
or even ${exec_prefix}.
HTH,
Keith.
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