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- The GNU Autoconf Archive is a collection of more than 500 macros for
- GNU Autoconf that have been contributed as free software by friendly
- supporters of the cause from all over the Internet. Every single one of
- those macros can be re-used without imposing any restrictions whatsoever
- on the licensing of the generated configure script. In particular, it is
- possible to use all those macros in configure scripts that are meant for
- non-free software. This policy is unusual for a Free Software Foundation
- project. The FSF firmly believes that software ought to be free, and
- software licenses like the GPL are specifically designed to ensure that
- derivative work based on free software must be free as well. In case of
- Autoconf, however, an exception has been made, because Autoconf is at
- such a pivotal position in the software development tool chain that the
- benefits from having this tool available as widely as possible outweigh
- the disadvantage that some authors may choose to use it, too, for
- proprietary software.
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