Long time ago, I posted a guide on how to make John the Ripper able to crack MD5 hashes (http://www.disenchant.ch/blog/teaching-john-the-ripper-how-to-crack-md5-hashes/106). In that posting where some errors and also it’s not up to date so I made a small shell script which downloads, patches and compile JtR 1.7.3.4 for you automatically

wget http://www.openwall.com/john/g/john-1.7.3.4.tar.gz
tar xvf john-1.7.3.4.tar.gz
wget http://www.openwall.com/john/contrib/john-1.7.3.4-jumbo-1.diff.gz
gunzip john-1.7.3.4-jumbo-1.diff.gz
cp john-1.7.3.4-jumbo-1.diff ./john-1.7.3.4
cd ./john-1.7.3.4
patch -p1 < john-1.7.3.4-jumbo-1.diff
cd ./src/
make clean linux-x86-any

This patched John the Ripper can attack the following formats:
DES/BSDI/MD5/BF/AFS/LM/NT/XSHA/PO/raw-MD5/IPB2/raw-sha1/md5a/hmac-md5/KRB5/bfegg/nsldap/ssha/openssha/oracle/MYSQL/mysql-sha1/mscash/lotus5/DOMINOSEC/NETLM/NETNTLM/NETLMv2/NETHALFLM/mssql/mssql05/epi/phps/mysql-fast/pix-md5/sapG/sapB/md5ns/HDAA

I hope you enjoy it