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-rw-r--r--manual/preamble.tex8
1 files changed, 8 insertions, 0 deletions
diff --git a/manual/preamble.tex b/manual/preamble.tex
index 9dc67dd25a..2d49623a57 100644
--- a/manual/preamble.tex
+++ b/manual/preamble.tex
@@ -77,6 +77,14 @@
\usepackage{makeidx}
\usepackage{fancyvrb}
\usepackage{color}
+
+% Ifpdfoutput is part of KOMAscript 3.28, in earlier versions it's ifpdfoutput.
+% We use Ifpdfoutput, so redefine it here for old KOMAscript versions.
+% See also https://ctan.org/ctan-ann/id/mailman.2801.1577740444.2586.ctan-ann@ctan.org
+\ifdefined\Ifpdfoutput%
+\else\newcommand{\Ifpdfoutput}{\ifpdfoutput}%
+\fi
+
\Ifpdfoutput{\usepackage{booktabs}}%
{\newcommand{%
\toprule}{}\newcommand{\midrule}{\hline}\newcommand{\bottomrule}{}%