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(m4.info)Compatibility

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Compatibility with other versions of `m4'
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   This chapter describes the differences between this implementation of
`m4', and the implementation found under UNIX, notably System V,
Release 3.

   There are also differences in BSD flavors of `m4'.  No attempt is
made to summarize these here.

Extensions

Extensions in GNU m4

Incompatibilities

Facilities in System V m4 not in GNU m4

Other Incompat

Other incompatibilities