On all non-desktop profile boxes I have: checking whether to use NLS... yes checking where the gettext function comes from... libc checking for intltool >= 0.35.0... 0.36.2 found checking for perl... /usr/bin/perl checking for XML::Parser... configure: error: XML::Parser perl module is required for intltool suggest XML-Parser should be added as a dependency, but emerging it by hand and then trying avahi again, I have another compilation failure. This will be filled in another bug report, however I thought it should be investigated. I use avahi on those boxes for nss-mdns. No fancy flags or overlays, thanks for considering.
This needs intltool, not XML-Parser dependency. Anyway, you have intltool already installed, this is clearly yet another dupe of Bug 41124.
Thanks, fixed. Actually it only needs XML::Parser, because the runtime intltool is bundled with avahi. But adding a intltool dependency is what most other packages do.