LuaTeX and XeTeX removed
In commit:25bcaa0a LuaTeX and XeTeX are deactivated since they don’t
compile with poppler 0.71.
There is a note in the commit saying that “The new texlive release is
about to come and should compile with newer poppler releases [..]
LuaTeX and XeTeX can than [sic] be enabled again”.
There is currently no issue to track this enabling, and removing of LuaTeX and XeTeX affects dependencies.
More information pertaining to the timeline of reactivating LuaTeX and XeTeX would be helpful.
(from redmine: issue id 10232, created on 2019-04-12, closed on 2019-06-19)