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-rw-r--r--Master/texmf-dist/source/latex/l3experimental/l3str/l3tl-build.dtx18
1 files changed, 16 insertions, 2 deletions
diff --git a/Master/texmf-dist/source/latex/l3experimental/l3str/l3tl-build.dtx b/Master/texmf-dist/source/latex/l3experimental/l3str/l3tl-build.dtx
index a64e2937d12..7f4504cb2de 100644
--- a/Master/texmf-dist/source/latex/l3experimental/l3str/l3tl-build.dtx
+++ b/Master/texmf-dist/source/latex/l3experimental/l3str/l3tl-build.dtx
@@ -34,8 +34,22 @@
%% -----------------------------------------------------------------------
%
%<*driver|package>
-\RequirePackage{expl3}
-\GetIdInfo$Id: l3tl-build.dtx 4745 2014-05-06 10:41:27Z joseph $
+% The version of expl3 required is tested as early as possible, as
+% some really old versions do not define \ProvidesExplPackage.
+\RequirePackage{expl3}[2014/08/25]
+%<package>\@ifpackagelater{expl3}{2014/08/25}
+%<package> {}
+%<package> {%
+%<package> \PackageError{l3tl-build}{Support package l3kernel too old}
+%<package> {%
+%<package> Please install an up to date version of l3kernel\MessageBreak
+%<package> using your TeX package manager or from CTAN.\MessageBreak
+%<package> \MessageBreak
+%<package> Loading l3tl-build will abort!%
+%<package> }%
+%<package> \endinput
+%<package> }
+\GetIdInfo$Id: l3tl-build.dtx 5378 2014-08-25 10:59:48Z joseph $
{L3 Experimental token list construction}
%</driver|package>
%<*driver>