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all autoconf packages that use gnu gettext for translations require
a tool called autopoint in order to run `autoreconf -i`, which is
the command to generate the configure script from configure.ac.
this is often needed to compile git checkouts of applications, because
they usually do not have the configure scripts and the other generated
files checked into their version control systems.
the autopoint tool is called without parameters, and it is required to
copy some m4 files into place and generate some other files.
this version here was created just by observing which error messages
would be thrown after running it and gradually adding functionality.
it was tested on a git checkout of weechat, and later on the source
tarballs of various packages like glib, and it seemed to work so far.
it's very likely that in future new scenarios will show up that require
additional files, but what we have right now is a good start.
the m4 files were taken from gnu gettext 0.18, and they are all licensed
under very liberal conditions. each file has the original copyright header.
there's only one m4 file i wrote myself, which is configheader.m4,
supplying a macro i couldn't otherwise find in gettext's source code.
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