commit de041b97d2017447e4142e1230dcac48abd270bd
Author: Cole Robinson <crobinso@redhat.com>
Date:   Mon Nov 22 11:18:55 2010 -0500

    virt-install: Fix locale error if piped to pager
    
    Not really sure what's going on, and I can only reproduce if commenting
    the setlocale call in setupGettext, but there is a bz about it:
    
    https://bugzilla.redhat.com/show_bug.cgi?id=655328

diff --git a/virtinst/cli.py b/virtinst/cli.py
index 8ed6534..352a05b 100644
--- a/virtinst/cli.py
+++ b/virtinst/cli.py
@@ -75,6 +75,8 @@ class VirtOptionParser(OptionParser):
         encoding = getattr(f, "encoding", None)
         if not encoding:
             (dummy, encoding) = locale.getlocale()
+        if not encoding:
+            encoding = "UTF-8"
         return encoding
 
     def print_help(self, file=None):