perl exits immediately with C.UTF-8 locale

[Adam Guthrie]

adam@whiteowl:~$ LC_ALL=C.UTF-8 perl
strxfrm() gets absurd.
adam@whiteowl:~$ echo $?
29

Found when attempting to install perl 5.14.1 as one of the test fails but affects the system version too.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: perl 5.12.4-4
ProcVersionSignature: Ubuntu 3.0.0-10.16-generic 3.0.4
Uname: Linux 3.0.0-10-generic i686
ApportVersion: 1.22.1-0ubuntu2
Architecture: i386
Date: Sat Sep 10 15:40:29 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu-Netbook 10.10 "Maverick Meerkat" - Alpha i386 (20100803.1)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: perl
UpgradeStatus: Upgraded to oneiric on 2011-09-10 (0 days ago)