Happstack dependency failure on Mac OS X 10.10 Yosemite - haskell

I am trying to install Happstack using the following command:
cabal install happstack
Specifications:
Mac OS X 10.10 (Yosemite)
GHC 7.8.3
cabal 1.20.0.2
Error Messages:
ld: library not found for -lHSstm-2.4.3-ghc7.8.3
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Failed to install threads-0.5.1.2
cabal: Error: some packages failed to install:
happstack-7.0.2 depends on threads-0.5.1.2 which failed to install.
happstack-server-7.3.9 depends on threads-0.5.1.2 which failed to install.
system-filepath-0.4.12 failed during the building phase. The exception was:
ExitFailure 1
threads-0.5.1.2 failed during the building phase. The exception was:
ExitFailure 1

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I have OS X Sierra and I'm trying to install psycopg2 version 2.6.2 within a virtual environment using virtualenv and Python 3.4. On the step "Running setup.py install for psycopg2" I get this error message:
ld: library not found for -lssl
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error: command '/usr/bin/clang' failed with exit status 1

I found that installing psycopg2 version 2.7.3.1 fixed the problem. So this bug must have been fixed in version 2.7 and above:
http://initd.org/psycopg/docs/news.html

pkg-config version of sdl2 is too low

I'm currently trying to get SDL2 for Haskell to work on Ubuntu but while trying to install SDL2 with cabal I get the following error
cabal: The pkg-config package sdl2 version >=2.0.3 is required but the version
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Failed to install sdl2-1.2.0
cabal: Error: some packages failed to install:
sdl2-1.2.0 failed during the configure step. The exception was:
ExitFailure 1
So it seems I do have pkg-config and I do have sdl2 but I seem to have downloaded the wrong version of libsdl-dev? I have the latest version, so is there a way for me to upgrade the pkg-config file?

Haskell how to resolve this error: Unsupported extension: MultiWayIf

while trying to install the friday package, I got the error
Preprocessing library friday-0.2.2.0...
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How to resolve this error?
I am using ghc version 7.4.1 and
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using version 1.14.0 of the Cabal library

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I try running:
cabal install memoize
in the Terminal but all I get is:
11 warnings and 1 error generated.
Failed to install memoize-0.6
cabal: Error: some packages failed to install:
memoize-0.6 failed during the building phase. The exception was:
ExitFailure 1
The 1 error is:
Data/Function/Memoize/TH.hs:5:6:
error: invalid preprocessing directive
#-}
^

How to install haskell Parallel on mac?

How to install haskell Parallel on mac?
I'm trying: '$sudo cabal install parallel' but its not working. I'm getting the following message:
Resolving dependencies...
Configuring parallel-3.2.0.0...
Preprocessing library parallel-3.2.0.0...
Building parallel-3.2.0.0...
<command line>: cannot satisfy -package-id deepseq-1.1.0.2-09b3aed0c4982bbc6569c668100876fa
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Thanks.

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