On 2018-03-05, Mikolaj Izdebski <mizdebsk at redhat.com> wrote: > config_opts['macros']['%dist'] = '.el7' Thanks, Mikolaj and Leon, for your answers. So this makes me wonder: what is the likelyhood of getting some error on RedHat without being able to detect it under CentOS? Let's say that my system builds in CentOS with modified %dist and then straight ahead for testing on a RedHat machine. Is there any chance of a building error which would happen under RedHat (but not under CentOS), which would introduce some subtle bug under RedHat?