def runtime(self, _from='0'):
        """Generate the set of instructions to install the runtime specific
        components from a build in a previous stage.

        # Examples

        ```python
        l = llvm(...)
        Stage0 += l
        Stage1 += l.runtime()
        ```
        """
        self.rt += comment('LLVM compiler runtime')
        if self.__runtime_ospackages:
            self.rt += packages(ospackages=self.__runtime_ospackages)
        self.rt += packages(apt=self.__runtime_debs,
                            apt_keys=self.__apt_keys,
                            apt_repositories=self.__apt_repositories,
                            scl=bool(self.__version), # True / False
                            yum=self.__runtime_rpms)
        return str(self.rt)
Generate the set of instructions to install the runtime specific
        components from a build in a previous stage.

        # Examples

        ```python
        l = llvm(...)
        Stage0 += l
        Stage1 += l.runtime()
        ```
        
hpccm/building_blocks/llvm.py