--- etex.src.orig	2015-09-16 14:17:48.263123165 -0400
+++ etex.src	2015-09-16 14:14:20.673610421 -0400
@@ -290,8 +290,10 @@
 
 \def \addlanguage #1#2#3#4#5% language patterns exceptions lhm rhm
     {\expandafter \et@xlang \csname lang@#1\endcsname
-     \expandafter \chardef \csname lhm@#1\endcsname=#4 % V1.0-1
-     \expandafter \chardef \csname rhm@#1\endcsname=#5 % V1.0-1
+     \def\paramD{#4}\ifx\paramD\empty\def\paramD{1}\fi % Default value lhm is 1 % V2.1-1
+     \def\paramE{#5}\ifx\paramD\empty\def\paramE{1}\fi % Default value rhm is 1 % V2.1-1
+     \expandafter \chardef \csname lhm@#1\endcsname=\paramD % V2.1-1
+     \expandafter \chardef \csname rhm@#1\endcsname=\paramE % V2.1-1
      \uselanguage {#1}%
      \input #2
      \if *#3*\else \input #3 \fi
@@ -776,6 +778,9 @@
 
 %% Revision-history:
 
+24-ARP-2015: 2.1;1  Allow empty values on \addlanguages for parameters 4 and 5
+                         Changed by Edgar Hoch
+
 01-FEB-1999: 2.1;0  Allow file to be used with e-TeX versions 2.0 and 2.1
 
 25-MAR-1998: 2.0;19 Improved log message for \{glob|loc}{marks|box}vector (PEB)