Q: is the information that --print-libdir returns available programmatically
to Haskell code?

   $ ghc --print-libdir
   C:\ghc\ghc-6.11.20090118

   $ ghc -e GHC.Paths.libdir
   "C:\\ghc\\ghc-6.11.20090118"

   $ ghc -e ':browse GHC.Paths'
   docdir :: FilePath
   ghc :: FilePath
   ghc_pkg :: FilePath
   libdir :: FilePath

   $ ghc-pkg find-module GHC.Paths
   c:/ghc/ghc-6.11.20090118\package.conf:
       ghc-paths-0.1.0.5

Claus

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