This is because BSD systems have a funciton named 'index' in
<string.h>, and if you compile with the -Wshadow flag, gcc warns
that our declaration of `index' shadows global declaration.
Thanks to Ben Laurie <ben@algroup.co.uk> for the problem report
and the suggested workaround.
git-svn-id: svn://10.0.0.236/trunk@10523 18797224-902f-48f8-a5cc-f745e15eee43
