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
        c = catalyst(...)
        Stage0 += c
        Stage1 += c.runtime()
        ```
        """
        self.rt += comment('ParaView Catalyst')
        if self.__runtime_ospackages:
            self.rt += packages(ospackages=self.__runtime_ospackages)
        self.rt += copy(_from=_from, src=self.prefix, dest=self.prefix)
        if self.ldconfig:
            self.rt += shell(commands=[self.ldcache_step(
                directory=posixpath.join(self.prefix, 'lib'))])
        self.rt += environment(variables=self.environment_step())
        return str(self.rt)
Generate the set of instructions to install the runtime specific
        components from a build in a previous stage.

        # Examples
        ```python
        c = catalyst(...)
        Stage0 += c
        Stage1 += c.runtime()
        ```
        
hpccm/building_blocks/catalyst.py