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On platforms that are not officially supported by GNU Autotools (like OS/2) it is necessary to generate configure and other related stuff using platform-specific Autoconf and Automake to make the build succeed. A script autoconf.sh added by this commit does that. Note that it's necessary to remove pre-generated upstream versions of these files from Git completely in order to avoid seeing multiple differences resulting from different versions of Autotools (and also to save some space - configure files are huge). This commit also adds a few minor bits to configure.ac/Makefile.am of a few projects to help autoconf.sh do its job properly. Needed for #2.
The libbacktrace library Initially written by Ian Lance Taylor <iant@google.com> The libbacktrace library may be linked into a program or library and used to produce symbolic backtraces. Sample uses would be to print a detailed backtrace when an error occurs or to gather detailed profiling information. The libbacktrace library is provided under a BSD license. See the source files for the exact license text. The public functions are declared and documented in the header file backtrace.h, which should be #include'd by a user of the library. Building libbacktrace will generate a file backtrace-supported.h, which a user of the library may use to determine whether backtraces will work. See the source file backtrace-supported.h.in for the macros that it defines. As of September 2012, libbacktrace only supports ELF executables with DWARF debugging information. The library is written to make it straightforward to add support for other object file and debugging formats.