[Nix-dev] Help me understand how to fix this installation (haskell package roman-numerals)

[Carlo Nucera]

Ok, the author was very kind and fast and released on hackage the new
version without that bound.
Now, how can I clear the cache of cabal2nix? When I try
cabal://roman-numerals it still get the precedent version (I'm guessing it'
cached because I don't see the usual downloading trace)

2014-11-07 19:51 GMT+01:00 Peter Simons <simons at cryp.to>:

> Hi Carlo,
>
>  > Configuring roman-numerals-0.5.1.4...
>  > Setup: At least the following dependencies are missing:
>  > text >=0.11 && <1.2
>
> it would be great if you could contact the authors of that package to
> inform them about this issue so that they can release an update.
>
> Meanwhile, you can probably work around the build failure by adding the
> flag "--jailbreak" to the cabal2nix command line when generating the
> expression. This will make the build ignore the upper boundary.
>
>
>  > Should I package also a version of text pre 1.2.0.0? What are naming
>  > conventions in this case?
>
> We have versions 0.11.0.5, 0.11.0.6, 0.11.1.5, 0.11.2.0, 0.11.2.3,
> 0.11.3.1, and 1.1.1.3 packaged in Nix already. Generally speaking,
> though, you should almost always avoid using an older version. It's much
> better for everyone to make the package build with the most recent
> version (which is oftentimes just a matter of ignoring the restrictions
> from the Cabal file).
>
> Best regards,
> Peter
>
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