Answering my own question: it seems I made a rookie mistake and specified --prefix=/Library/Haskell which is where 7.4.1 lives. I just specified --prefix=/usr/lib and as far as I can tell everything works. On 27 Mar 2013, at 11:40, Dominic Steinitz wrote:

Hi,

I followed the instructions pointed to from here: http://www.haskell.org/ghc/download_ghc_7_6_2#macosx_x86_64

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bash-3.2$ ./configure --prefix=/Library/Haskell

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bash-3.2$ sudo make install

But sadly I get:

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bash-3.2$ ghc-pkg list ghc-pkg: missing --global-package-db option, location of global package database unknown

and

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bash-3.2$ ghc --make nnClassifier.lhs -O2 ghc: missing -B<dir> option

Any advice on how to get 7.6.2 working would be much appreciated.

Dominic.

Here's some more information:

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bash-3.2$ which ghc-pkg /Library/Haskell/lib/ghc-7.6.2/ghc-pkg bash-3.2$ which ghc /Library/Haskell/lib/ghc-7.6.2/ghc

7.4.1 still works fine:

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bash-3.2$ ghc-pkg-7.4.1 list /Library/Frameworks/GHC.framework/Versions/7.4.1-x86_64/usr/lib/ghc-7.4.1/package.conf.d: Cabal-1.14.0 GLUT-2.1.2.1

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bash-3.2$ ghc-7.4.1 --make nnClassifier.lhs -O2 -fforce-recomp [1 of 6] Compiling MatrixPlus ( MatrixPlus.hs, MatrixPlus.o ) [2 of 6] Compiling NeuralNet ( NeuralNet.hs, NeuralNet.o ) [3 of 6] Compiling Backprop ( Backprop.hs, Backprop.o ) [4 of 6] Compiling MarineExplore ( MarineExplore.hs, MarineExplore.o ) [5 of 6] Compiling Runner ( Runner.hs, Runner.o ) [6 of 6] Compiling Main ( nnClassifier.lhs, nnClassifier.o ) Linking nnClassifier ... ld: warning: directory not found for option '-L/opt/local/lib/' bash-3.2$ ./nnClassifier Reading training labels... Read 100 labels[(1,0),(2,1),(3,0),(4,1),(5,0),(6,0),(7,1),(8,0),(9,1),(10,0)] Reading training images... 9:9 9:9