Alternatively you could just remove the fllvm flag from the gloss raster cabal file.  

I actually spoke with Ben about this, and he insists that the performance different is large enough to be worth only supporting fllvm for his lib.  

On Thursday, March 6, 2014, Brandon Allbery <allbery.b@gmail.com> wrote:
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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