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  • Adrian Sanchez Soto thinks this is interesting:

From the perspective of a developer working with Autoconf, you create a file configure.ac to be the input for Autoconf. configure.ac (which used to be named configure.in) is written in a mixture of GNU m4 (a macro processing language) and Unix shell commands. However, you need to ship only the generated configure file, not its precursors.

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Cover of Practical Development Environments

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autoconf