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" (where is formatting doc for this wiki? bye):

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