Cabal install failure

[tcfuji]

I executed cabal undate and cabal install HLearn-algebra but it keeps trying to install ConstraintKinds-1.1.0.0 which always fails. This is strange since in the repository it asks for >=1.2.0 .

[thelastjosh]

I'm getting the same problem.
Look forward to testing out this library!

[timjstewart]

I'm trying to work through this:

https://izbicki.me/blog/gausian-distributions-are-monoids

and I get this:

Failed to install ConstraintKinds-1.1.0.0
cabal: Error: some packages failed to install:
ConstraintKinds-1.1.0.0 failed during the building phase. The exception was:
ExitFailure 1
HLearn-algebra-1.1.0.1 depends on ConstraintKinds-1.1.0.0 which failed to
install.

[wildman1234]

It works for me with ghc 7.6.3. Executed this in a sandbox: cabal install constraintkinds-1.1.0.0 -w path/to/ghc7.6.3 The sandbox may or may not be important..

[damienstanton]

This is also happening to me, using ghc 7.8.4 and cabal 1.22.
Are there any workarounds for these issues besides using a downgraded sandboxed ghc?

[mikeizbicki]

@damienstanton The version on hackage will only run on ghc 7.6. The master branch has a number of significant improvements, however, so that's what I'd recommend using. That should compile with your setup, but you'll first need to install the latest version of subhask (https://github.com/mikeizbicki/subhask) which is not on hackage at all.

[damienstanton]

Got it. Thank you for the replies!

[malcolmgreaves]

I am attempting to work through the gausian-distributions-are-monoids post as well. I am a Haskell newbie; I am quite unfamiliar with cabal. I attempted cabal install HLearn-distributions, which failedc since it still depends on ConstraintKinds-1.1.0.0. Is there any work on updating the default repository that cabal uses so that the installation command above will succeed?

[mikeizbicki]

This will happen sometime this summer, but I'm sorry that I can't be more
specific than that with a date.

On Mon, Jun 1, 2015 at 4:50 PM, Malcolm Greaves [email protected]
wrote:

I am attempting to work through the gausian-distributions-are-monoids post
as well. I am a Haskell newbie; I am quite unfamiliar with cabal. I
attempted cabal install HLearn-distributions, which failedc since it
still depends on ConstraintKinds-1.1.0.0. Is there any work on updating
the default repository that cabal uses so that the installation command
above will work?

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