Description of problem:
rhythmbox is missing some BuildRequires in the spec file. I was investigating
why audioscrobbler support hadn't been built in (it defaults to enabled in
configure unless its dependancies aren't installed), but came across a few
problems when building.

Firstly, it is missing a BuildRequires on gstreamer-devel. When it came to
building, and I found I hadn't installed gstreamer-devel, the build failed. As
you well know, rpmbuild usually grunts if you are missing a BuildRequire :)

Secondly, it is missing a build dependancy on libtool. The build fails quite
late in because of this.

Thirdly, the executable links against libsoup but the build fails unless
libsoup-devel is installed. As a result, I suspect this may be a BuildRequire also. 

Version-Release number of selected component (if applicable):
rhythmbox-0.9.4-2

How reproducible:
Always.

Steps to Reproduce:
1. rpm -e gstreamer-devel libtool libsoup-devel
2. rpmbuild --rebuild rhythmbox-0.9.4-2.src.rpm
3. See it fail until you install at least gstreamer-devel, libtool and
libsoup-devel.

I am sorry for such a pedantic bug report!