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Editorial Team
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Asked: 2026-05-14T04:50:43+00:00

So I recently installed cabal (from the default binary of ArchLinux). I then tried

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So I recently installed cabal (from the default binary of ArchLinux).
I then tried to upgrade cabal as a user:

cabal upgrade Cabal –user –prefix=$USER
Resolving dependencies…
cabal: fromFlag NoFlag. Use fromFlagOrDefault

What I’ve already done:

  1. Googled the error message. Turned up the cabal source and little else.
  2. Looked at haskell-wiki on cabal-install.
  3. Looked through this guide.

So basically I’m wondering:

  • What’s up with the error message?
  • Could anyone point me in the direction of a cabal tutorial?
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1 Answer

  1. Editorial Team

    I think that’s a bug in Arch’s package. I’m running Arch as well, and I got the same error.

    I then built cabal-install (0.8.2) from Hackage, which didn’t complain when I run cabal upgrade Cabal. In fact, it started building right away, although I didn’t let it finish because I didn’t feel comfortable upgrading a core package.

    May I ask why you wanted to upgrade Cabal? The version that comes with ghc is 1.8.0.2, and the latest version is 1.8.0.4 — not too distant IMO. Besides, if you’re running cabal-install as normal user, why not simply cabal install? It doesn’t have permission to overwrite the system files anyway.

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