On Sun, 29 Oct 2017 14:40:56 +0100 vychytraly . wrote: > Frank please could you explain how to create rpms for el7 from fedora > src.rpms? The complexity of doing this will vary a lot with what you're trying to compile, but for userland programs like email clients, text editors, games and the like it can be very easy to do in a lot of cases. As Johnny says, you don't really want to do this with core operating system functions since you can end up with a Frankenstein system that might not work properly any more. In many cases (more than a few but by no means all) you can compile a Fedora rpm for Centos using the following procedure. ......... Frank, Thanks very much for explaining this process. I would like to have orthanc usable for Centos 7, but the epel repos only have it for Centos 6. I will give your outline a try!!! Greg