>> I think the best and most portable approach would be to have the
>> autoconf infrastructure find and substitute in appropriate default
>> values for DIFFCMD and SEDCMD via DIFFCMD=@DIFF@ and SEDCMD=@SED@,
>> I know that is how grep(1) and egrep(1) is handled by the groff
>> project currently.
>>
>> My guess is that we would need to add something to configure.ac,
>> and maybe a makefile to make this happen.
>
> Werner, can you point me at something that would explain turning
> gdiffmk.sh into something autoconf would manage?
It is already managed; you only have to extend it.
1. In configure.ac (or in m4/groff.m4) a test for the `diff' program
is needed, probably using AC_CHECK_PROGS; autoconf doesn't provide
something in advance – note that the `configure' script itself
already needs the `diff' program, but it doesn't provide a macro;
it simply assumes that it is available in the path. `sed' is
covered by AC_PROG_SED.
2. In gdiffmk.sh, use @SED@ and @DIFF@ (or whatever symbols are
actually used in configure.ac) instead of `sed' and `diff'.
3. In the sub-makefile `contrib/gdiffmk/gdiffmk.am' you have to extend
the `gdiffmk' rule to substitute @SED@ and @DIFF@ with its real
values.
Werner
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