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Happstack Lite is breaking on me because it's getting blaze-html version 0.5 and it wants version 0.4. Cabal says that both versions 0.4.3.4 and 0.5.0.0 are installed. I want to remove the 0.5.0.0 and use just the older version. But cabal does not have an "uninstall" command, and when I try ghc-pkg unregister --force blaze-html, ghc-pkg says my command has been ignored.
What do I do?
UPDATE: Don't believe it. Although ghc-pkg claims to ignore the command, the command isn't ignored. And with Don Stewart's accepted answer you can remove exactly the version you wish to eliminate.
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There is no way to uninstall packages in Cabal. Currently, cabal-install doesn't know how to uninstall packages. The best you can do is to unregister the package with the GHC package-database manager, eliminating the package metadata from the database without removing the actual files.
Uninstallation. On linux, just run ghcup nuke , then make sure any ghcup added lines in your ~/. bashrc (or similar) are removed. On windows, right click on the Uninstall Haskell.
You can ghc-pkg unregister a specific version, like so:
$ ghc-pkg unregister --force regex-compat-0.95.1 That should be sufficient.
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