The last package that I needed to install Postfix onto a RH v7.2 virtual s390 machine was something called 'alternatives'. I was unable to find anything on my favorite MCS mirror, and likewise was unable to find any s390 RPMs. I did managed to find a src.rpm for 'alternatives', and performed an RPM --Rebuild on it without any apparent incident after which it appeared to install nicely. However, when I tried to install Postfix once again, it failed because it still needed /usr/sbin/alternatives.
I did notice that the rebuild of 'alternatives' produced a noarch.rpm file rather than the expected s390.rpm file. The rebuild on the db4 src.rpm file produced a corresponding s390.rpm file which installed very nicely and paved the way for an equally successful rebuild of the Postfix src.rpm file. So, I suspect that I have an issue with the 'alternatives' src.rpm file. And this is where I bacame stuck. I cannot seem to locate any other 'alternatives' src.rpm file. Let me know if you have any suggestions. Thank you.
