Fails to install on Mac Haskell Platform, even with reinstall.

[Folcon]

Loading package comonad-4.0 ... linking ... ghc: 
lookupSymbol failed in relocateSection (relocate external)
/Users/user/Library/Haskell/ghc-7.6.3/lib/comonad-4.0/lib/HScomonad-4.0.o: unknown symbol `_semigroupszm0zi12zi1_DataziSemigroup_zlzg_info'
ghc: unable to load package `comonad-4.0'
Failed to install profunctors-4.0.2
World file is already up to date.
cabal: Error: some packages failed to install:
lens-4.0.4 depends on profunctors-4.0.2 which failed to install.
profunctors-4.0.2 failed during the building phase. The exception was:
ExitFailure 1
snap-0.13.2.2 depends on profunctors-4.0.2 which failed to install.

Reinstalled Haskell Platform from scratch, didn't help, not sure where to proceed from here, would love to try this out.

[mightybyte]

We're going to need a bit more information from you. Things like OS version, GHC version, cabal version, etc.

[Folcon]

That's fine, OS 10.9.1, The Glorious Glasgow Haskell Compilation System, version 7.6.3 and:

cabal-install version 1.18.0.3
using version 1.18.1.2 of the Cabal library

[gregorycollins]

See the instructions here: http://www.haskell.org/haskellwiki/Mac_OS_X#Mac_OS_X_10.9_.28Mavericks.29.2C_Mac_OS_X_10.8_.28Mountain_Lion.29_and_Xcode_5

[Folcon]

Ah, I've made all those changes, multiple times, my haskell appears to run fine, it's just I can't seem to install snap, if it's due to the compiler change over (I'm currently using gcc-4.8), I'm presently trying to see if I can keep installing older versions and upgrade.

[Folcon]

ok, that worked, once I ran cabal install snap-0.13.0 then cabal install snap succeeded. I did however have to first rm -fr ~/.ghc as mentioned in the docs, but even after doing that I couldn't install snap straight, only 0.13.0