Install mercurial: yum install mercurial

hg clone http://hg.code.sf.net/p/openfoam-extend/swak4Foam openfoam-extend-swak4Foam

cd openfoam-extend-swak4Foam

hg update port_2.0.x

mv swakConfiguration.centos6 swakConfiguration

module load openfoam/2.3.x   # or 2.2.x
./Allwmake