@UlrikeFischer The error I’m getting happens also with LuaTeX built from the git repo without my changes $ luatex --shell-escape example-luatex-ffi.tex This is LuaTeX, Version 1.09.0 (TeX Live 2019/dev) system commands enabled. (./example-luatex-ffi.tex (./luatex-basics.tex) (./luatex-fonts.tex <push names pace> <./luatex-fonts-merged.lua>(using write cache: /home/khaled/.texlive/texm f-var/luatex-cache/generic)(using read cache: /var/lib/texmf/luatex-cache/gener ic /home/khaled/.texlive/texmf-var/luatex-cache/generic)./luatex-fonts-merged.l
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