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Adding new configurable parameters

Initialize new configurable parameters at the beginning of the configure script, in the relevant section (installation, or compilation). Later the settings for these parameters are written out to the Makefile; new parameters should also be written out to this Makefile. If the parameter is to be used as a macro within the source code, it should be written out to the file config.h, which is done by the make version command after configure has been updated and a new Makefile has been created.