do a base install of Centos, without openoffice…
Now add some more packages.
yum install autoconf automake e2fsprogs-devel gcc-c++ glibc-devel glibc-headers kernel-devel krb5-devel libacl-devel libgomp libstdc++-devel libtermcap-devel libxml2-devel lsscsi m4 make mt-st mysql mysql-devel mysql-server ncurses ncurses-devel openssl-devel perl-DBI php php-gettext php-pear qt4 qt4-devel redhat-rpm-config rpm-build rpm-devel rpm-libs screen zlib-devel
This list could probably be reduced down, but I don't have the time/inclination to do that just yet.
Now install the epel repo
rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-4.noarch.rpm
and install some more
yum install qwt qwt-devel wxGTK
create the build folders
mkdir /usr/src/redhat mkdir /usr/src/RPM mkdir /usr/src/packages
and change their permissions
chmod -R 777 /usr/src/redhat chmod -R 777 /usr/src/RPM chmod -R 777 /usr/src/packages
as a user, setup a build environment, I use one that I found here http://www.oldrpm.org/hintskinks/buildtree/
wget http://www.oldrpm.org/hintskinks/buildtree/RPM-build-tree.txt chmod 755 RPM-build-tree.txt ./RPM-build-tree.txt
download the bacula .src.rpm files to a directory in the user folder structure (not as root!)
then in that directory, as that non root user
rpmbuild --rebuild --define "build_centos5 1" --define "build_mysql5 1" --define "build_bat 1" --define "build_wzconsole 1" bacula-5.0.3-1.src.rpm rpmbuild --rebuild --define "build_centos5 1" --define "build_mysql5 1" --define "build_bat 1" --define "build_wzconsole 1" bacula-bat-5.0.3-2.src.rpm rpmbuild --rebuild --define "build_centos5 1" --define "build_mysql5 1" --define "build_bat 1" --define "build_wzconsole 1" bacula-mtx-5.0.3-1.src.rpm rpmbuild --rebuild --define "build_centos5 1" --define "build_mysql5 1" --define "build_bat 1" --define "build_wzconsole 1" bacula-docs-5.0.3-1.src.rpm
then install, as an elevated user, the .rpm files from the build directories
Now you need to setup the database
Add the user to MySQL
mysql -p and then enter your password
set password for 'bacula'@'localhost' = password ('YourPassword');
set password for 'bacula'@'%' = password ('YourPassword');
quit
If you have one set, before running the scripts to create the database, you need to edit them to allow for a MySQL administrator level password
cd /usr/lib/bacula/ nano grant_mysql_privileges nano create_mysql_database nano make_mysql_tables
Original:
if $bindir/mysql $* -u root -f <<END-OF-DATA
Modified:
if $bindir/mysql -p $* -u root -f <<END-OF-DATA
cd /usr/lib/bacula/ ./grant_mysql_privileges ./create_mysql_database ./make_mysql_tables
start the services
You should now have a working installation of bacula. Configuring the tape library I leave as an exercise for the reader 
None of the above is my own work, I just assembled various parts that I found on many sites into a single document.
