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-rw-r--r--tex/context/base/syst-ini.tex4
1 files changed, 4 insertions, 0 deletions
diff --git a/tex/context/base/syst-ini.tex b/tex/context/base/syst-ini.tex
index fb3732074..c37f6850e 100644
--- a/tex/context/base/syst-ini.tex
+++ b/tex/context/base/syst-ini.tex
@@ -441,6 +441,10 @@
\newif\ifdone
+%D Potential primitive in \LUATEX:
+
+\ifdefined\htdp \else \def\htdp#1{\dimexpr\ht#1+\dp#1\relax} \fi
+
%D \macros
%D {@@escape,@@begingroup,@@endgroup,@@mathshift,@@alignment,
%D @@endofline,@@parameter,@@superscript,@@subscript,