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The Wheezy ghc won't work with our Haskell bits so we need to install the 6.12 binaries from haskell.org. These require a few packages unavailable in Wheezy so we need to manually download and install them from the Squeeze repos. You can get the three needed packages here:
httpshttp://packagesarchive.debian.org/debian/pool/eomain/squeezeg/i386gmp/libgmpxx4ldbl/downloadhttps_4.3.2+dfsg-1_i386.deb
http://packagesarchive.debian.org/eo/squeeze/i386/libgmp3c2/downloadhttps://packagesdebian/pool/main/g/gmp/libgmp3c2_4.3.2+dfsg-1_i386.deb
http://archive.debian.org/debian/pool/eomain/squeezeg/i386gmp/libgmp3-dev/downloadSelect the mirror closest to you and save the deb files on your system. _4.3.2+dfsg-1_i386.deb
Install them with dpkg:
$ sudo dpkg -i libgmpxx4ldbl_4.3.2+dfsg-1_i386.deb libgmp3c2_4.3.2+dfsg-1_i386.deb libgmp3-dev_4.3.2+dfsg-1_i386.deb...