def use_built_igraph(self):
buildcfg.include_dirs = [os.path.join("<STR_LIT>", "<STR_LIT>")]<EOL>buildcfg.library_dirs = [os.path.join("<STR_LIT>", "<STR_LIT>")]<EOL>buildcfg.static_extension = True<EOL>buildcfg_file = os.path.join("<STR_LIT>", "<STR_LIT>")<EOL>if os.path.exists(buildcfg_file):<EOL><INDENT>buildcfg.libraries = eval(open(buildcfg_file).read())<EOL><DEDENT>
Assumes that igraph is built already in ``igraphcore`` and sets up
        the include and library paths and the library names accordingly.