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The build system is built around an Automake-replacing Makefile
snippet system for GNU Make that I wrote, called Autothing. It is
documented in `build-aux/Makfile.README.txt`. It provides all of the
standard targets and such; you tell it what to do by setting a series
of `at.whatever` or `std.whatever` variables.
There are a couple of variables that get automatically set from git.
This happens by `include`ing a hidden makefile that sets them; if
`$(topsrcdir)/.git` exists, it knows to use git to generate it;
otherwise it expects the file to exist:
| variable | file |
|--------------------+----------------------------------------|
| srcfiles | $(srcdir)/.srcfiles.mk |
| LIBRETOOLS_VERSION | $(topsrcdir)/.srcversion-libretools.mk |
| LIBRETOOLS_COMMIT | $(topsrcdir)/.srcversion-libretools.mk |
| DEVTOOLS_VERSION | $(topsrcdir)/.srcversion-devtools.mk |
| DEVTOOLS_COMMIT | $(topsrcdir)/.srcversion-devtools.mk |
`srcfiles` basically becomes `std.src_files`.
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