I should mention that many people, perhaps all, will need to re-run
the top level autogen.sh for gtk_ardour:
cd $TOP
sh ./autogen.sh gtk_ardour
then redo configure for gtk_ardour:
cd $TOP/gtk_ardour
./configure ...your opts here...
this is necessitated by the changes in the i18n system. Sorry for the
inconvenience.
--p