From the imapsync Changelog file: revision 1.697 date: 2016/06/12 18:42:18; author: gilles; state: Exp; lines: +53 -24 Perl critic fixes. 10 x "Unnamed numeric literals make code less maintainable.". use Readonly to fix them. If you try to run imapsync-1.836, it fails. $ imapsync --help Can't locate Readonly.pm in @INC (you may need to install the Readonly module) (@INC contains: /etc/perl /usr/local/lib64/perl5/5.24.3/x86_64-linux /usr/local/lib64/perl5/5.24.3 /usr/lib64/perl5/vendor_perl/5.24.3/x86_64-linux /usr/lib64/perl5/vendor_perl/5.24.3 /usr/local/lib64/perl5 /usr/lib64/perl5/vendor_perl /usr/lib64/perl5/5.24.3/x86_64-linux /usr/lib64/perl5/5.24.3 .) at /usr/bin/imapsync line 691. BEGIN failed--compilation aborted at /usr/bin/imapsync line 691.
I can confirm: I received this error on a fresh install. Installing dev-perl/Readonly resolved it.
I can confirm, too. Problem as well as solution.
*** This bug has been marked as a duplicate of bug 652916 ***