yum install autoconf automake e2fsprogs-devel gcc-c++ glibc-devel glibc-headers krb5-devel libacl-devel libgomp libstdc++-devel libtermcap-devel libxml2-devel m4 make mysql mysql-devel mysql-server ncurses ncurses-devel openssl-devel perl-DBI php readline-devel redhat-rpm-config rpm-build screen zlib-devel

• Download bacula-5.0.3-1.src.rpm.
• As a normal user, do:

cd
rpm -i bacula-5.0.3-1.src.rpm
mkdir rpm_build
nano ~/.rpmmacros

• Add the following to ~/.rpmmacros:

%_topdir    %(echo ${HOME}/rpm_build)
%_tmppath   %{_topdir}/tmp

• Modify the ~/rpm_build/SPECS/bacula.spec. On Scientific Linux, there is an error in the distribution check lines. I solved it by modifying it as below:

# check what distribution we are
%if %{rhat} || %{rhel}
%define _dist %(cat /etc/redhat-release)

• Also the dependencies are flawed if you try to install bacula-mysql or postgresql. You need to change the libtermcap-lines to refer to ncurses-devel package (which provides libtermcap.so files).
• I used this line to compile the new installable rpms:

rpmbuild -ba ~/rpm_build/SPECS/bacula.spec --define "build_mysql 1" --define "build_bat 0" --define "build_rhel5 1"