On 11-08-29 02:39 PM, Albert Y. C. Lai wrote:
ghc-pkg unregister --user P drops the global package if P is not in user.
[etc]
Now as ticket http://hackage.haskell.org/trac/ghc/ticket/5442
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For package P,
ghc-pkg unregister --user P drops the global package if P is not in user.
ghc-pkg unregister --global P drops the user package if P is in user.
ghc-pkg unregister --package-conf=dir P drops the user or the global
package, preferring the user one, if P is not found in dir.