This directory contains the build system. In consists mainly of makefile
templates for different directory roles.
:'global.mk': This file contains global variables, for example the
definitions of the tools to use.
:'generic.mk': Generic rules for creating file types from others.
:'prg.mk': This file represents the target binary role of a directory.
It must be included by all makefiles that build programs.
:'lib.mk': This file represents a library role. It is never used from
within the 'src/' directory but only from the <libname>.mk files
in 'lib/mk/'.
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