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-rw-r--r--Build/source/texk/web2c/luatexdir/lua/luastuff.w3
1 files changed, 3 insertions, 0 deletions
diff --git a/Build/source/texk/web2c/luatexdir/lua/luastuff.w b/Build/source/texk/web2c/luatexdir/lua/luastuff.w
index 7274a683637..a2b1dd14327 100644
--- a/Build/source/texk/web2c/luatexdir/lua/luastuff.w
+++ b/Build/source/texk/web2c/luatexdir/lua/luastuff.w
@@ -153,6 +153,9 @@ static const luaL_Reg lualibs[] = {
/* coroutine is loaded in a special way */
{ "bit", luaopen_bit },
#else
+#if LUA_VERSION_NUM == 503
+ { "utf8", luaopen_utf8 },
+#endif
{ "coroutine", luaopen_coroutine },
#endif
/* additional (public) libraries */