The source code here requires a version of ghc built from the simd branch. Vectors primops only work when compiling with -fllvm. You will also need to patched version of the primitive, vector, and dph libraries. You can check out a complete source tree using the bin/ghc-simd-clone.sh script. For example:

./bin/ghc-simd-clone.sh http://darcs.haskell.org/ghc.git ghc-simd

This will check out the simd branch of ghc in ghc-simd, perform a sync-all get, and then check out the simd branches of the primitive, vector, and dph libraries. If you have a local mirror of http://darcs.haskell.org/ghc.git at LOCAL, this might be faster:

./bin/ghc-simd-clone.sh LOCAL ghc-simd

After checking out a complete source tree with the ghc-simd-clone.sh script, configure and build as you would normally (see the GHC wiki). Note that ghc-simd-clone.sh automatically enables the quick-llvm BuildFlavour.

Windows

Unfortunately, Win32 requires a patch to LLVM due to the fact that the stack is only 4-byte aligned on Win32, causing LLVM to 1) insert extra prologue/epilogue code to align the stack, and 2) disable tail calls. The patch tricks LLVM into thinking 128-bit SSE registers only need to be 4-byte aligned. GHC's LLVM mangler then rewrites all movaps instructions (for register spills) to movups instructions (only on Win32) so that SSE registers really do only have to be 4-byte aligned :) The patch is in the patches directory, here.