Installation of OpenFOAM-1.6-ext on Centos 5.5 64-bit
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Network download and installation from:
ftp://mirrors.usc.edu/pub/linux/distributions/centos/5.5/os/x86_64/

Basic configuration:
    Desktop - Gnome
    Packages from CentOS Extras: unchecked

    Complete installation log: /root/install.log

Run Package updater to update your installation

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Add your user as a valid user for the command 'sudo'. 

You will need to use the command 'visudo' as the user root for this. 

I won't go into the details for this, there is a lot of info all over the Net
for doing this relatively minor adjustment. 

In doubt, simply ask your local Unix guru.

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# Add the EPEL package repository:
sudo rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm

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# Installation of additional system packages:

sudo yum install git-1.7.4.1-1.el5.x86_64
sudo yum install gcc.x86_64 gcc-c++.x86_64
sudo yum install bison.x86_64
sudo yum install flex.x86_64
sudo yum install rpm-build-4.4.2.3-22.el5.x86_64
sudo yum install zlib-devel-1.2.3-3.x86_64
sudo yum install libX11-devel.x86_64
sudo yum install libXext-devel.x86_64
sudo yum install libXrender-devel.x86_64
sudo yum install libXt-devel-1.0.2-3.2.el5.x86_64

# You can also install everything at once:

sudo yum install \
    git-1.7.4.1-1.el5.x86_64   \
    gcc.x86_64 gcc-c++.x86_64  \
    bison.x86_64               \
    flex.x86_64                \
    rpm-build-4.4.2.3-22.el5.x86_64 \
    zlib-devel-1.2.3-3.x86_64 \
    libX11-devel.x86_64 \
    libXext-devel.x86_64 \
    libXrender-devel.x86_64 \
    libXt-devel-1.0.2-3.2.el5.x86_64

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# Download OpenFOAM-1.6-ext

mkdir ~/OpenFOAM
cd ~/OpenFOAM
git clone git://openfoam-extend.git.sourceforge.net/gitroot/openfoam-extend/OpenFOAM-1.6-ext


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# We need to tweak our OpenFOAM setup using the prefs.sh file

cp ~/OpenFOAM/OpenFOAM-1.6-ext/etc/prefs.sh-EXAMPLE \
   ~/OpenFOAM/OpenFOAM-1.6-ext/etc/prefs.sh

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# We are going to use version 4.4.5 of gcc, provided by the ThirdParty packages
#
# The versions provided by Centos 5.5 are either too old, or a just a preview
# version of gcc 4.4.0, which is a bit 'green'.
# 
# So the system installed compiler will only serve to compile gcc 4.4.5.

# Modify the etc/prefs.sh file to switch to gcc 4.4.5
sed -i s/"compilerInstall=System"/"compilerInstall=OpenFOAM\nWM_COMPILER=Gcc44"/g ~/OpenFOAM/OpenFOAM-1.6-ext/etc/prefs.sh

# Activate the compilation of gcc 4.4.5 in the ThirdParty/AllMake.stage1 file
sed -i 0,/"#( rpm_make -p gmp-5.0.1"/s//"( rpm_make -p gmp-5.0.1"/ ~/OpenFOAM/OpenFOAM-1.6-ext/ThirdParty/AllMake.stage1
sed -i 0,/"#( rpm_make -p mpfr-3.0.1"/s//"( rpm_make -p mpfr-3.0.1"/ ~/OpenFOAM/OpenFOAM-1.6-ext/ThirdParty/AllMake.stage1
sed -i 0,/"#( rpm_make -p gcc-4.4.5"/s//"( rpm_make -p gcc-4.4.5"/ ~/OpenFOAM/OpenFOAM-1.6-ext/ThirdParty/AllMake.stage1

# Add the wmake rules set for Gcc44
ln -s ~/OpenFOAM/OpenFOAM-1.6-ext/wmake/rules/linux64Gcc ~/OpenFOAM/OpenFOAM-1.6-ext/wmake/rules/linux64Gcc44

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# We are going to use the version of QT4 provided by the ThirdParty packages

# Uncomment and modify the initialization of the variables QT_THIRD_PARTY in the
# file prefs.sh

sed -i s/"#export QT_THIRD_PARTY=1"/"export QT_THIRD_PARTY=1"/g ~/OpenFOAM/OpenFOAM-1.6-ext/etc/prefs.sh

# This section of the prefs.sh file should now look like this:

export QT_THIRD_PARTY=1
#export QT_DIR=path_to_system_installed_qt
#export QT_BIN_DIR=$QT_DIR/bin


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# Source this initial OpenFOAM environment to get the basic configuration for
# compilation
. ~/OpenFOAM/OpenFOAM-1.6-ext/etc/bashrc

# You will get some warnings about missing file for gcc-4.4.5, and problem with
# your compiler installation.
# This is quite normal, your gcc-4.4.5 compiler is not even compiled and
# installed yet. Patience patience...

# Compile the ThirdParty packages, including the gcc 4.4.5 compiler

cd $WM_PROJECT_DIR/ThirdParty
./AllMake >& log.AllMake &
tail -f log.AllMake   # To keep an eye on the compilation process

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# Update your OpenFOAM environment to get the basic configuration from the newly
# compiled ThirdParty packages

. ~/OpenFOAM/OpenFOAM-1.6-ext/etc/bashrc

# Compile OpenFOAM-1.6-ext

cd $WM_PROJECT_DIR
./Allwmake >& log.Allwmake &  
tail -f log.Allwmake          # To keep an eye on the compilation process

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# Execute Allwmake a second time because of a bad library building sequence for
# the library -lfaceDecompositionMotionSolver 

./Allwmake >& log.Allwmake2 & 
tail -f log.Allwmake2          # To keep an eye on the compilation process

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# Run a tutorial to check the basic functionality

cd $FOAM_TUTORIAL/incompressible/simpleFoam/pitzDaily
blockMesh >& log.blockMesh
simpleFoam >& log.simpleFoam
paraFoam

# You are done!

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Martin Beaudoin
August 2011