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Hackage 2 doesn't support byte ranges at the moment, which makes curl exit with
error if there's an incomplete tarball present. Fixes #1675.

There were three errors in CC detection:

1. The wrong variable was used in the for loop.

2. The selected CC was checked for existence and execute perm,
   but instead of the full path to the executable just the basename
   was passed to test -x.

3. The info log message accidentally printed the value of CC.

Downloading was failing with curl which seems
not do http redirect by default.

This change simple updates the urls from

Hackage 1's http://hackage.haskell.org/packages/archive/$PKG/$VER/$PKG-$VER.tar.gz to
Hackage 2's http://hackage.haskell.org/package/$PKG-$VER/$PKG-$VER.tar.gz

which makes curl happy and downloads work again.

cabal.git 7f9c23d8 fails when configuring network:
checking whether the C compiler works... no

To fix that, update network version to 2.4.2.2.

See #1634.

Cabal (the library) itself depends on these packages, so they should be
installed first. See #1486.

Fixes #1473.

Masahiro Yamauchi authored Jul 01, 2013 and Mikhail Glushenkov committed Jul 09, 2013

Also add SCOPE_OF_INSTALLATION to 'setup install'.

Following the third comment here (of dafis)  http://stackoverflow.com/questions/16128503/trouble-with-installing-cabal-on-mac it seems that mtl-1.* should not be permitted by the regex on line 56, 

    MTL_VER="2.1.2";       MTL_VER_REGEXP="[12]\."     # == 1.* || == 2.*

since in fact mtl-1 is rejected by the build-depends in the cabal file, which mentions  

    mtl      >= 2.0      && < 3

But perhaps this is a wrong understanding.

This is in place of the deprecated implementation from
Control.Concurrent. New implementation due to Simon Marlow. Note that
this has only been tested against stm-2.4 despite the permissive version
bounds given in the cabal file and bootstrap script.

network-2.3.1.0 does not build on Windows with GHC 7.6.1.

Contributed by Tuncer Ayaz.

deepseq is a dependency of text, and not included with ghc-7.0.4.