spec file for multiple distributions.

[Martin Hamant <mh accelance fr>]

Hi,

I have to write a specfile which need to build on many redhat/centos
distributions with differents versions. The software that I have to
build needs special action on sources regarding the distribution. What
is the best way to do this these days ? Is there a builtin function in
RPM to autodetect the distro name and version ? (el3, el4, el5?) ?

About rpmforge packages, i don't really understand how does it works:
they use %{dist} but it's defined in a macro? and about naming
packages : can i dynamically name a package regarding to the
distribution it's been built ?

Thank you !!

-- 
Martin