Many thanks! It turned out that llc and opt is installed in: usr/local/Cellar/llvm/3.3/bin/

After changing ghc settings, gloss-raster installed correctly ;-)

Thanks
m.

From: Brandon Allbery <allbery.b@gmail.com>
Date: Thursday, March 6, 2014 4:12 PM
To: Miroslav Karpis <miroslav.karpis@gmail.com>
Cc: Carter Schonwald <carter.schonwald@gmail.com>, Charles-Pierre Astolfi <cpa@crans.org>, Haskell Cafe <haskell-cafe@haskell.org>
Subject: Re: [Haskell-cafe] gloss-raster: Couldn't figure out LLVM version! (osx 10.8.5)

On Thu, Mar 6, 2014 at 10:07 AM, Miroslav Karpis <miroslav.karpis@gmail.com> wrote:
In the file I can see following lines:
("LLVM llc command", "llc"),
("LLVM opt command", "opt") 

When I changed llc to "usr/bin/llvm-gcc" nothing happened. So I guess I should edit something else?,….

llc is not llvm-gcc (and even if it were, the leading / on /usr/bin is not optional). If you have LLVM installed via brew, you are probably looking for /usr/local/bin/llc and /usr/local/bin/opt for those two. 

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