patch applied (cabal-install): Don't add installed constraints system packages that are not installed

Wed Jan 14 06:35:40 PST 2009 Duncan Coutts * Don't add installed constraints system packages that are not installed In particular fixes a problem (ticket #439) where we required the installed version of ghc-prim with compilers that do not have that package such as ghc-6.8 and older, hugs, nhc, lhc etc. M ./Distribution/Client/Dependency.hs -4 +4 View patch online: http://darcs.haskell.org/cabal-install/_darcs/patches/20090114143540-adfee-c...