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-rw-r--r--tex/context/base/mult-sys.mkiv1
1 files changed, 1 insertions, 0 deletions
diff --git a/tex/context/base/mult-sys.mkiv b/tex/context/base/mult-sys.mkiv
index 06a4912a3..aa0b535a1 100644
--- a/tex/context/base/mult-sys.mkiv
+++ b/tex/context/base/mult-sys.mkiv
@@ -481,6 +481,7 @@
\definesystemvariable {bt} % BuTton
\definesystemvariable {bu} % BUffer
\definesystemvariable {bv} % Brieven
+\definesystemvariable {bx} % BackendExport
\definesystemvariable {by} % Per
\definesystemvariable {cb} % CollectBox
\definesystemvariable {cc} % Comment