Set the LANG environment variable

frameworks/Haskell/yesod/bash_profile.sh

@@ -1,2 +1,3 @@
 # Where to find the ghc and cabal executables
 export PATH="/opt/ghc/7.8.3/bin:/opt/cabal/1.20/bin:$PATH"
+export LANG=en_US.UTF-8

toolset/setup/linux/languages/haskell78.sh

@@ -4,6 +4,9 @@ RETCODE=$(fw_exists /opt/ghc/7.8.3/bin/ghc)
 [ ! "$RETCODE" == 0 ] || { return 0; }
 
 lsb_release -a
+env
+
+export LANG=en_US.UTF-8
 
 sudo add-apt-repository -y ppa:hvr/ghc
 sudo apt-get update