on the iBCS part for %install there are several calls to
mknod, which can no made as a normal user. building the
iBCS devices would be better done on a %post script or
telling the user to use MAKDEV.iBCS which is installed
If you do it in the %post, you can't verify the package correctly.
At some point, there might be a mechanism in RPM to allow for packaging
of special files in a different manner. Until then, we probably won't
fix this, or the dev package.