Polyhedron_base._volume_lrs: Use Lrs().absolute_filename()

Author: Matthias Koeppe

src/sage/geometry/polyhedron/base.py

@@ -2006,7 +2006,7 @@ def _volume_lrs(self, verbose=False):
         if verbose:
             print(in_str)
 
-        lrs_procs = Popen(['lrs', in_filename],
+        lrs_procs = Popen([Lrs().absolute_filename(), in_filename],
                           stdin=PIPE, stdout=PIPE, stderr=PIPE)
         ans, err = lrs_procs.communicate()
         ans = bytes_to_str(ans)