Re: [Haskell-beginners] LTS is good but...

I can't really explain the details of what's going on here. It seems that in some cases different versions of the executables are being found, but I don't know why. Wiping out your sandbox (cabal sandbox delete) and starting over may be sufficient to recover. On Wed, Mar 4, 2015 at 11:11 AM emacstheviking wrote:

As requested,

iMac:~ vosabristol$ ghc --version The Glorious Glasgow Haskell Compilation System, version 7.8.3

which ghc /opt/local/bin/ghc

Hmm.... it shows a macports instsallation of GHC... but I am sure that's how I git it... I *used* to use the OSX installation package but I thought a clean start using MacPorts would somehow change the mood...

iMac:~ vosabristol$ cabal --version cabal-install version 1.16.0.2 using version 1.16.0 of the Cabal library

iMac:~ vosabristol$ which cabal /usr/bin/cabal

So... there is a possible case for *once again* performing a complete and utter removal of Haskell and its partners in crime and doing a fresh installation?

Out of frustration I built OCaml and OPAM from sources last night but I'd still like to go with GHC!

:)

On 3 March 2015 at 20:43, Michael Snoyman wrote:

...

Funny that there's an issue being discussed in the cabal issue tracker right now[1] similar to this. But the report you're giving here is particularly strange. Cabal-1.16 implies that you're using GHC 7.6, which is supported by the claim that base 4.7 isn't available. I'd recommend starting off with running the following commands and pasting the output:

ghc --version which ghc cabal --version which cabal

[1] https://github.com/haskell/cabal/issues/2438

On Tue, Mar 3, 2015 at 10:21 PM emacstheviking wrote:

...

Forgot to add that somehow, despite the upgrade, my cabal version has gone backwards from 1.20.0.1 to 1.16.0

WTF?

On 3 March 2015 at 20:19, emacstheviking wrote:

...

I started an OpenGL project within an LTS sandbox as guided on another post and, somewhat foolishly it would see, I did a "cabal install cabal-install" when prompted that a new version was available.

The very next time I tried to work on my code.... I got this:

bash-3.2$ pwd /Users/seancharles/Documents/Coding/haskell/lts1 bash-3.2$ cabal build cabal: You need to re-run the 'configure' command. The version of Cabal being used has changed (was Cabal-1.20.0.1, now Cabal-1.16.0). bash-3.2$ cabal configure Resolving dependencies... Configuring lts1-0.1.0.0... cabal: At least the following dependencies are missing: base ==4.7.* bash-3.2$ cabal build cabal: You need to re-run the 'configure' command. The version of Cabal being used has changed (was Cabal-1.20.0.1, now Cabal-1.16.0). bash-3.2$ ls -l total 112 -rw-r--r-- 1 seancharles staff 19 Mar 2 12:53 LICENCSE -rw-r--r-- 1 seancharles staff 552 Mar 3 20:09 Main.hs -rw-r--r-- 1 seancharles staff 477 Mar 3 20:07 Main.hs~ -rw-r--r-- 1 seancharles staff 46 Mar 2 12:52 Setup.hs -rw-r--r-- 1 seancharles staff 30198 Mar 2 12:51 cabal.config -rw-r--r-- 1 seancharles staff 1090 Mar 2 12:51 cabal.sandbox.config drwxr-xr-x 5 seancharles staff 170 Mar 2 12:53 dist -rw-r--r-- 1 seancharles staff 1932 Mar 2 12:52 lts1.cabal bash-3.2$

So, welcome to a different kind of hell, "cabal version hell" perhaps?

Can anybody help me get it running again? Thanks. Sean.

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