Installing Hakyll on MacOS

objact

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May 6, 2021, 1:51:17 PM5/6/21

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Hi, I am in the first year of my CS undergrad. We are learning Haskell at university right now and I am trying to install Hakyll to create a blog. I am using cabal 3.4.0.0, MacOS BigSur 11.2.2 and GHCi 9.0.1. When I try to run cabal new-install hakyll I get the following error message:

Resolving dependencies...

cabal: Could not resolve dependencies:

[__0] trying: hakyll-4.14.0.0 (user goal)

[__1] trying: hakyll:+usepandoc

[__2] next goal: pandoc (dependency of hakyll +usepandoc)

[__2] rejecting: pandoc-2.13, pandoc-2.12 (conflict: hakyll +usepandoc =>

pandoc>=2.11 && <2.12)

[__2] trying: pandoc-2.11.4

[__3] next goal: haddock-library (dependency of pandoc)

[__3] rejecting: haddock-library-1.10.0 (conflict: pandoc =>

haddock-library>=1.8 && <1.10)

[__3] trying: haddock-library-1.9.0

[__4] next goal: base (dependency of hakyll)

[__4] rejecting: base-4.15.0.0/installed-4.15.0.0 (conflict: haddock-library

=> base>=4.5 && <4.15)

[__4] skipping: base-4.15.0.0 (has the same characteristics that caused the

previous version to fail: excluded by constraint '>=4.5 && <4.15' from

'haddock-library')

[__4] rejecting: base-4.14.1.0, base-4.14.0.0, base-4.13.0.0, base-4.12.0.0,

base-4.11.1.0, base-4.11.0.0, base-4.10.1.0, base-4.10.0.0, base-4.9.1.0,

base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0, base-4.7.0.2,

base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0, base-4.5.1.0,

base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0, base-4.3.0.0,

base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0, base-4.0.0.0,

base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable package requires

installed instance)

[__4] fail (backjumping, conflict set: base, haddock-library, hakyll)

After searching the rest of the dependency tree exhaustively, these were the

goals I've had most trouble fulfilling: pandoc, hakyll, base,

hakyll:usepandoc, haddock-library, pandoc:setup.Cabal

I am a newbie when it comes to coding, so any help is greatly appreciated. Thank you very much! :D

Laurent P. René de Cotret

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May 6, 2021, 3:22:22 PM5/6/21

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Hello,

This error message means that you cannot build hakyll using GHC 9.0.1, which is bundled with base-4.15.

You need to “downgrade” to GHC 8.10, which is bundled with base-4.14

Laurent

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objact

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May 6, 2021, 3:56:58 PM5/6/21

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Okay, I will do that. Thank you very much!

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