rpm doesn't like my OS

[jamacias]

Hi.
I am trying to install the rpm packages like:
rpm -i rtems-base-binutils-2.9.5.0.24-1.i386.rpm

but I get a message:

package rtems-base-binutils-2.9.5.0.24-1.i386.rpm is for a different
operating system.

I'm running  Gentus Linux  (I guess similar to RedHat) on a celeron
machine, I was under the impression that these rpm packages would work
with any flavor of Linux.  Is this correct?.
Any help will be much appreciated.
Alfredo