Centos dependencies

 su -c 'yum install gcc-c++ m4 openssl-devel db4-devel boost-devel git'


If you still get errors one of these might help you out:

Compiling OpenSSL (for CentOS users)

This step is only required if you’re using CentOS. Red Hat has removed support for elliptic curve cryptography from the OpenSSL it supplies.

Code:
 cd
 rm -rf openssl-1.0.1e.tar.gz openssl-1.0.1e
 wget http://ftp://ftp.pca.dfn.de/pub/tools/net/openssl/source/openssl-1.0.1e.tar.gz
 tar xzvf openssl-1.0.1e.tar.gz
 cd openssl-1.0.1e
 ./config shared --prefix=/usr/local --libdir=lib
 make
 sudo make install

Compiling miniupnpc (for CentOS users)

Code:
 cd
 rm -rf miniupnpc-1.6.20120509.tar.gz
 wget http://miniupnp.tuxfamily.org/files/download.php?file=miniupnpc-1.6.20120509.tar.gz
 tar xzvf miniupnpc-1.6.20120509.tar.gz
 cd miniupnpc-1.6.20120509
 make
 sudo INSTALLPREFIX=/usr/local make install