GHC static binaries with glibc-2.12?

Hi all, I recently upgraded my Arch Linux system to glibc 2.12 and static binaries compiled with GHC 6.12.3 all fail with the message "mkTextEncoding: invalid argument (Invalid argument)". This did not happen with glibc 2.11. Has anyone else had this problem? Does anyone have any advice for debugging it? Thanks, Alex