Autotools Versions Used in This Book

The Autotools are always being updated—on average, a significant update of each of the three tools, Autoconf, Automake, and Libtool, is released every year and a half, and minor updates are released every three to six months. The Autotools designers attempt to maintain a reasonable level of backward compatibility with each new release, but occasionally something significant is broken, and older documentation simply becomes out of date.

While I describe new significant features of recent releases of the Autotools, in my efforts to make this a more timeless work, I've tried to stick to descriptions of Autoconf features (macros for instance) that have been in widespread use for several years. Minor details change ...

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