cd($this->source_dir) ->exec("make PREFIX='" . BUILD_ROOT_PATH . "' clean") ->exec("make -j{$this->builder->concurrency} {$this->builder->getEnvString()} PREFIX='" . BUILD_ROOT_PATH . "' libbz2.a") ->exec('cp libbz2.a ' . BUILD_LIB_PATH) ->exec('cp bzlib.h ' . BUILD_INCLUDE_PATH); } }