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      sources : [string]
        list of source filenames, relative to the distribution root
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      include_dirs : [string]
        list of directories to search for C/C++ header files (in Unix
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      define_macros : [(name : string, value : string|None)]
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      libraries : [string]
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      extra_objects : [string]
        list of extra files to link with (eg. object files not implied
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        any extra platform- and compiler-specific information to use
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      export_symbols : [string]
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      depends : [string]
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