code: def apply_patch(self, filename, arch, build_dir=None):
          
          info("Applying patch {}".format(filename))
          build_dir = build_dir if build_dir else self.get_build_dir(arch)
          filename = join(self.get_recipe_dir(), filename)
          shprint(sh.patch, "-t", "-d", build_dir, "-p1",
                  "-i", filename, _tail=10)
docs: Apply a patch from the current recipe directory into the current
          build directory.
  
          .. versionchanged:: 0.6.0
              Add ability to apply patch from any dir via kwarg `build_dir`'''