Use gcc-generated dependency files if we can (GNU Make and gcc required).
* Makefile.in: If AUTO_DEPEND is defined, make gcc generate dependency files in deps/. Include those files into Makefile. * config.in: Generated (AUTO_DEPEND). * configure.in: --enable-autodepend is new. Check for GNU Make and that gcc supports -MMD -MF. Define AUTO_DEPEND if we can use gcc and GNU make to generate dependencies.
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