>sudo rpmbuild -bb --define build_postgresql=1 --define "build_centos5 1" --
>define rhel_version=501 bacula.spec

Not only do you not need to unpack the srpm to get the the spec to build from
But you shouldn't at all build as root?

Use a buidroot [1]:
$ rpmbuild --rebuild --define build_centos5=1 --define build_mysql=1 
bacula-5.0.3-1.src.rpm
Etc...

Jlc

[1] http://www.owlriver.com/tips/non-root/

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