def load_pip_requirements(self, files_map=None, freeze=True):
        if files_map is None:
            files_map = self.default_pip_files
        for group, requirements_txt in files_map.items():
            path = Path(requirements_txt)
            if not path.exists() and group.lower() == "all" and freeze:
                cmd = envoy.run("pip freeze")
                self[group].loads(cmd.std_out)
            elif path.exists():
                self[group].load(path)
def build(self, spec, prefix):
        """Build using the OpenFOAM Allwmake script, with a wrapper to source
        its environment first.
        Only build if the compiler is known to be supported.
        """
        self.foam_arch.has_rule(self.stage.source_path)
        self.foam_arch.create_rules(self.stage.source_path, self)

        args = []
        if self.parallel:  # Build in parallel? - pass via the environment
            os.environ['WM_NCOMPPROCS'] = str(make_jobs)
        builder = Executable(self.build_script)
        builder(*args)