Unable to install on clean RHEL 7.2

[robert-blankenship]

After trying to run cabal install blank-canvas --force-resintalls I get the following error message:

[RyanGlScott]

I'm guessing you're using GHC 7.6. blank-canvas's dependencies no longer build with GHC 7.6 (and we only test with 7.8 and later), so we should probably bump the minimum version bounds of base to reflect this. Sorry about the confusion.

[RyanGlScott]

I've revised the Hackage metadata so that one cannot construct a build plan with GHC 7.6.

[robert-blankenship]

Thanks @RyanGlScott

[robert-blankenship]

I am now getting the following warning when trying to install on a clean Fedora 23 environment (which has a newer Haskell than the previous RHEL 7.2).

cabal: The following packages are likely to be broken by the reinstalls:
haskell-platform-2014.2.0.0.2
Use --force-reinstalls if you want to install anyway

My GHCI is now >= 7.8, as you graciously pointed out :). It shipped with the haskell-platform package that I installed using dnf.

After running cabal install --force-reinstalls blank-canvas it did install successfully, but the error message was scary.

[robert-blankenship]

Also, how do I get it to accept non-local connections? :)

[robert-blankenship]

Figured it out :)

{-# LANGUAGE OverloadedStrings #-}
module Main where

import Graphics.Blank                     -- import the blank canvas

main = blankCanvas (Options 8000 [] True "." [] False) $ \ context -> do -- start blank canvas on port 3000
        send context $ do                 -- send commands to this specific context
                moveTo(50,50)
                lineTo(200,100)
                lineWidth 10
                strokeStyle "red"
                stroke()

[andygill]

For non-local, it is better to use

main = blankCanvas 8000 { middleware = [] } $ \ context -> ...

Which removes the local_only Middleware from the Options. The number of Options in options may change in the next version and this solution would still work.