C.2 autoheader
autoheader runs m4 over ‘configure.in’, but
with key macros defined differently than when autoconf is
executed, such that suitable cpp definitions are output to
‘config.h.in’.
| | user input files optional input process output files
================ ============== ======= ============
aclocal.m4 - - - - - - - .
(acconfig.h) - - - -. |
V V
.----------,
configure.in ----------------------->|autoheader|----> config.h.in
`----------'
|
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