On 27 May 2010 16:46, Magicloud Magiclouds wrote:

I only have one alex installed under ~/.cabal/bin. It seems working with shell environment, but not cabal.

This sounds like a similar problem to one that occurred a couple of months ago. If you use "~/.cabal/bin/" for your PATH variable, try replacing that with "$HOME/.cabal/bin/".

On Thu, May 27, 2010 at 1:40 PM, Axel Simon wrote:

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Hi Magicloud,

On May 27, 2010, at 4:11, Magicloud Magiclouds wrote:

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Hi, I have met similar problem before, and I do not know what to do.

# cabal install --reinstall gtk2hs-buildtools Resolving dependencies... Configuring gtk2hs-buildtools-0.9... cabal: alex is required but it could not be found. cabal: Error: some packages failed to install: gtk2hs-buildtools-0.9 failed during the configure step. The exception was: ExitFailure 1 # alex -v Alex version 2.3.3, (c) 2003 Chris Dornan and Simon Marlow

I don't think this is due to us. Are there perhaps other alex installations on your path? Or in ~/.cabal/bin?

Axel

...

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On Thursday 27 May 2010 08:46:04, Magicloud Magiclouds wrote:

I only have one alex installed under ~/.cabal/bin. It seems working with shell environment, but not cabal.

My guess: You added ~/.cabal/bin to the path, but have quoted the path, like export PATH="~/.cabal/bin:$PATH" in your .bashrc That does not work. Tilde expansion is *not* done for quoted strings, so cabal looks (among other places) for "~/.cabal/bin/alex". Now, there is no directory "~" in your file system, so alex is not found. Check: $ printenv PATH If the output contains ~, it won't work. If it doesn't, well then something else must be broken. Fixes 1) don't quote the path, export PATH=~/.cabal/bin:$PATH works. 2) (better) Use $HOME instead of ~ (works quoted or unquoted) 3) write out your home directory completely