To reproduce on current master: 1. open lib/doc/sk/Intro.lyx 2. go to Document > Settings > Fonts, check "Use non-TeX fonts" and set all to e.g. DejaVu Sans 3. File > Export > PDF (LuaTeX)
I get an error: ! Undefined control sequence. \english@language ->\language =\l@ukenglish \xpg@set@language@luatex@ii {uke... l.222 \textenglish[variant=british]{independent} In step 3, if instead of exporting I preview with PDF (LuaTeX), there is no error. Here is the diff of the exported Intro.tex files in each case (taken from the temporary directory): $ diff bad/Intro.tex good/Intro.tex 5c5 < \documentclass[12pt,british,english,slovak]{article} --- > \documentclass[12pt,english,british,slovak]{article} 57c57 < \setotherlanguage{english} --- > \setotherlanguage[variant=british]{english} $ Scott
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