[NTG-context] meta-imp-fen in mkxl?

Hi all, I wanted to use a rightbrace as background for a table, as defined in meta-imp-fen.mkiv. Unfortunately, I can't get it to work, for 2 reasons: 1. meta-imp-fen doesn't appear to be ported to mkxl. 2. When I try to compile with the --luatex switch, I get this error message: tex error > tex error on line 101 in file /mnt/shared/lmtx/tex/texmf-context/tex/context/base/mkiv/meta-imp-dum.mkiv: ! Undefined control sequence l.101 \newinteger \c_grph_replacement_n So, I'm a bit stymied right now. What can be done? All best Thomas