--On Wednesday, October 02, 2019 3:33 PM +0200 Adrian van Bloois <adrian at pa0rda.nl> wrote: > I tried to compile the latest version of postfix, runs fine on C6 and C7, > on C8 it fails. > Complaining about missing ypclnt.h, this should com from glibc-headers. That looks like a header from a deprecated glibc rpc library that was removed long ago. <https://www.linuxquestions.org/questions/slackware-14/glibc-rpcsvc-vanished-in-l-glibc-2-14-1-i486-2-txz-913702/> Are you using the latest spec file from the C8 postfix to build the latest version? That's what I do when I want a newer version than what's on the distro, patching the spec file as needed.