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build_clibav
Override the default build_clib behaviour to do the following:
1. Implement a rudimentary timestamp-based dependency system
so 'compile()' doesn't run every time.
2. Add more keys to the 'build_info' dictionary:
* obj_deps - specify dependencies for each object compiled.
this should be a dictionary mapping a key
with the source filename to a list of
dependencies. Use an empty string for global
dependencies.
* cflags - specify a list of additional flags to pass to
the compiler.
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