$ perl -e 'use re "taint"; open FH, pop; close FH;' ">somefile"
$ perl -T -e 'open FH, pop; close FH;' ">somefile"
Insecure dependency in open while running with -T switch at -e line 1.
$ perl -v

This is perl, v5.8.2 built for i686-linux
 . . .