should install ghc-pkg with versioned name again
The build system has always installed ghc and ghc-pkg as a link to ghc-x.y and ghc-pkg-x.y on unix systems. In the current ghc-6.10 builds this is only done for ghc and ghci, not for ghc-pkg. It should be done for both.
It's very useful for people who install multiple versions of ghc simulataniously. Also cabal expects to find ghc-pkg with a corresponding name to ghc. If you specify
cabal install -w ghc-6.10.1 then it will look for
ghc-6.10.1 on the path and then look for
ghc-pkg-6.10.1 in the same location.