1 files changed, 26 insertions, 3 deletions
diff --git a/macros/latex/base/ifthen.dtx b/macros/latex/base/ifthen.dtx
index ef7d8ab398..0bbe361211 100644
--- a/macros/latex/base/ifthen.dtx
+++ b/macros/latex/base/ifthen.dtx
@@ -30,7 +30,7 @@
 %%
 %% File `ifthen.dtx'.
 %% Copyright (C) 1991 by Leslie Lamport
-%% Copyright (C) 1994-2001 LaTeX project, David Carlisle
+%% Copyright (C) 1994-2024 LaTeX project, David Carlisle
 %%                       all rights reserved.
 %%
 %
@@ -42,7 +42,7 @@
 %<driver>\ProvidesFile{ifthen.drv}
 % \fi
 %         \ProvidesFile{ifthen.dtx}
-          [2022/04/13 v1.1d Standard LaTeX ifthen package (DPC)]
+          [2024/03/16 v1.1e Standard LaTeX ifthen package (DPC)]
 %
 % \iffalse
 %<*driver>
@@ -273,15 +273,35 @@
          \ifx##1\relax\z@\else\expandafter##2##1\fi}}}
 %    \end{macrocode}
 %    \begin{macrocode}
+\begingroup
+\lccode`\~`\> %
+\catcode`\+\active
+\lccode`\+`\< %
+\catcode`\!\active
+\lccode`\!`\= %
+\lowercase{\endgroup
+%    \end{macrocode}
+%    \begin{macrocode}
+\def\TE@repl@active{%
+  \TE@repl~>%
+  \TE@repl+<%
+  \TE@repl!=%
+}
+%    \end{macrocode}
+%    \begin{macrocode}
 \long\def\ifthenelse#1{%
 %    \end{macrocode}
 % \changes{v1.0h}{1994/05/14}{Use \cs{TE@repl}}
+% \changes{v1.1e}{2024/03/16}{replace active \cs{ifnum} syntax}
 %    \begin{macrocode}
   \toks@{#1}%
   \TE@repl\or\TE@or
   \TE@repl\and\TE@and
   \TE@repl\not\TE@neg
 %    \end{macrocode}
+%    \begin{macrocode}
+  \TE@repl@active
+%    \end{macrocode}
 %
 % \changes{v1.1c}{2001/05/25}{Added \cs{AND}, \cs{OR} and \cs{NOT} as
 %    boolean operators as alternative to the lower case versions
@@ -353,7 +373,10 @@
           \expandafter\@firstoftwo
         \else
           \expandafter\@secondoftwo
-        \fi}
+        \fi}%
+%    \end{macrocode}
+%    \begin{macrocode}
+}
 %    \end{macrocode}
 % \end{macro}
 %