I'll keep in mind if I want to set up a testing environment.
Anyway, as far as I can see the -devel's are not complete yet, have a look:
[root@localhost FG-devel]# apt-get install *.rpm
Reading Package Lists... Done
Building Dependency Tree... Done
Selecting libOpenSceneGraph-devel for 'libOpenSceneGraph-devel-2.8.1-1pclos2009.i586.rpm'
Selecting libOpenThreads-devel for 'libOpenThreads-devel-2.8.1-1pclos2009.i586.rpm'
Selecting openal-soft-devel for 'openal-soft-devel-1.8.466-1pclos2009.i586.rpm'
Selecting SimGear-devel for 'SimGear-devel-1.9.1-1pclos2009.i586.rpm'
Some packages could not be installed. This may mean that you have
requested an impossible situation or that some of the repositories
in use are in an inconsistent state at the moment.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
SimGear-devel: Depends: plib-devel
openal-soft-devel: Depends: openal-soft (= 1.8.466) but it is not installable
Conflicts: openal-devel (<= 0.0.8 )
E: Broken packages