[opensuse-packaging] How do I make rpm output a message on installation?

The new blender-2.79 has a compatibility problem with the previous version. Do I simply use cat message file or echo in %postin to output a warning message or is there another way? Thanks Dave P -- To unsubscribe, e-mail: opensuse-packaging+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-packaging+owner@opensuse.org