[Haskell-cafe] Build problems (hsp, trhsx, ultimately Happstack)

Consider the following bash session: [ ajs@kizaru:~/ ]$ which trhsx /home/ajs/.cabal/bin/trhsx [ ajs@kizaru:~/ ]$ trhsx Usage: trhsx <infile> [<outfile>] [ ajs@kizaru:~/ ]$ cabal install hsp Resolving dependencies... Configuring hsp-0.4.5... Preprocessing library hsp-0.4.5... Building hsp-0.4.5... ghc: could not execute: trhsx cabal: Error: some packages failed to install: hsp-0.4.5 failed during the building phase. The exception was: ExitFailure 1 Does anybody have any suggestions? I'm trying to install Happstack on Arch Linux (GHC 6.12.1). ~/.cabal/bin/ is in my path and trhsx runs. I've had this problem before, and I think I ran cabal as root for the HSP package. That's not working this time. I get the same failure.