YESOD Installation Errors

#Silvester 2011: surfed through Hackage, did cabal install filepath, then cabal install yesod fails, because the filepath package is too new. result of ghc-pkg list:

root@aguy:/home/aguy# ghc-pkg list
/var/lib/ghc-6.12.1/package.conf.d
   Cabal-1.8.0.2
   ConfigFile-1.0.6
   FileManip-0.3.2
   GLUT-2.1.2.1
   HTTP-4000.0.9
   HUnit-1.2.2.1
   MissingH-1.1.0.3
   OpenGL-2.2.3.0
   QuickCheck-2.1.0.3
   array-0.3.0.0
   base-3.0.3.2
   base-4.2.0.0
   bin-package-db-0.0.0.0
   bytestring-0.9.1.5
   cgi-3001.1.7.2
   containers-0.3.0.0
   deepseq-1.1.0.0
   directory-1.0.1.0
   dph-base-0.4.0
   dph-par-0.4.0
   dph-prim-interface-0.4.0
   dph-prim-par-0.4.0
   dph-prim-seq-0.4.0
   dph-seq-0.4.0
   extensible-exceptions-0.1.1.1
   fgl-5.4.2.2
   filepath-1.1.0.3
   ghc-6.12.1
   ghc-binary-0.5.0.2
   ghc-prim-0.2.0.0
   harp-0.4
   haskell-src-1.0.1.3
   haskell98-1.0.1.1
   hpc-0.5.0.4
   hslogger-1.0.9
   html-1.0.1.2
   integer-gmp-0.2.0.0
   language-c-0.3.1.1
   mtl-1.1.0.2
   network-2.2.1.7
   old-locale-1.0.0.2
   old-time-1.0.0.3
   parallel-2.2.0.1
   parsec-2.1.0.1
   pretty-1.0.1.1
   process-1.0.1.2
   random-1.0.0.2
   regex-base-0.93.1
   regex-compat-0.92
   regex-posix-0.94.1
   rts-1.0
   stm-2.1.1.2
   syb-0.1.0.2
   template-haskell-2.4.0.0
   text-0.7.1.0
   time-1.1.4
   unix-2.4.0.0
   utf8-string-0.3.4
   xhtml-3000.2.0.1
   xml-1.3.7
   zlib-0.5.2.0
/root/.ghc/i386-linux-6.12.1/package.conf.d
   Cabal-1.10.2.0
   Crypto-4.2.4
   QuickCheck-2.4.2
   Useful-0.0.6
   binary-0.5.0.2
   dataenc-0.14.0.3
   filepath-1.2.0.1
   network-2.2.1.7
   parsec-3.1.2
   pkcs1-1.0.2