diff -up src/sage/geometry/polyhedron/base.py.orig src/sage/geometry/polyhedron/base.py --- src/sage/geometry/polyhedron/base.py.orig 2014-02-07 12:36:06.514837620 -0200 +++ src/sage/geometry/polyhedron/base.py 2014-02-07 12:36:16.918838019 -0200 @@ -3406,11 +3406,6 @@ class Polyhedron_base(Element): David Avis's lrs program. """ - if is_package_installed('lrs') != True: - print 'You must install the optional lrs package ' \ - 'for this function to work' - raise NotImplementedError - from sage.misc.temporary_file import tmp_filename from subprocess import Popen, PIPE in_str = self.cdd_Vrepresentation()