This is all built for Gajim's 1.1 branch, right? The OMEMO plugin on gajim-plugins 1.1 branch is on version 2.6.28 (are you bundling a master branch plugin version here?).
This is all built for Gajim's 1.1 branch, right? The OMEMO plugin on gajim-plugins 1.1 branch is on version 2.6.28 (are you bundling a master branch plugin version here?).