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The build system is built around an automake-like system for GNU Make
that I wrote. It is documented in `automake.txt`. It provides all of
the standard targets and such; you tell it what to do by setting a
series of `am_whatever` variables. I'm just going to call it
"automake" here.
I also hook into non-exposed parts of automake with a couple of
`_am_whatever` variables. Hopefully I will come up with good ways to
expose the needed functionality in the future.
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 `am_src_files`.
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