<software, tool> The GNU project's tool that configures a source code
distribution to compile and run on a different platform.
Among open source hackers, a mere running binary of a program is not considered
a full release; what's interesting is a source tree that can be built into
binaries using standard tools. Since the mid-1990s, autoconf, automake, and
libtools have been the standard way to make a distribution portable so that it
can be built on multiple operating systems without change.
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