from http://aur.archlinux.org/packages.php?ID=35370 deteego wrote: You can add the -fproduction flag to setup configure in the PKGBUILD to build yesod with GHC 7.0.2. i.e. change runhaskell Setup configure -O --enable-split-objs --enable-shared to runhaskell Setup configure -O --enable-split-objs --enable-shared -fproduction --- If you no longer wish to receive notifications about this package, please go the the above package page and click the UnNotify button.