1   acconfig.h       configure.in                 Makefile.am
2       |                |                           |
3       |  --------------+----------------------     |
4       |  |             |                     |     |
5       v  v             |    acinclude.m4     |     |
6   *autoheader*         |         |           v     v
7       |                |         v      --->*automake*
8       v                |--->*aclocal*   |       |
9   config.in            |         |      |       v
10                        |         v      |   Makefile.in
11                        |    aclocal.m4---
12                        |     |
13                        v     v
14                       *autoconf*
15                           |
16                           v
17                       configure
18