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autoscan

autoscan is used to detect potential portability problems with alredy written programs. That is, it scans the programms and finds, for example, functions that are not installed on all platforms.
Running autoscan checks configure.ac (or alternatively configure.in) for completeness and produces a configure.scan which gives hints as to what needs to go into the configure.ac.
The produced configure.scan can then be modified into a suitable configure.ac.