I am working on the build system for mod_atom, an Apache module: http://code.google.com/p/mod-atom/ This module builds against TidyLib, so I use AC_CHECK_HEADER() to check for buffio.h, and checkout the TidyLib source code from SourceForge using CVS if it is not found: http://mod-atom.googlecode.com/svn/trunk/configure.ac Unfortunately there is a problem building mod_atom on Mac OS X because the version of TidyLib distributed by MacPorts is old and does not define the type 'TidyAllocator', leading to the following compile error: [...] filter.c:57: error: syntax error before 'TidyAllocator' [...] What is the "correct" way to use autoconf to check that version of TidyLib it finds is new enough? Thanks! Jack
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