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diff --git a/mjo-complex.tex b/mjo-complex.tex
index 23d440f..25c6872 100644
--- a/mjo-complex.tex
+++ b/mjo-complex.tex
@@ -1,4 +1,10 @@
 % Operations used when dealing with complex numbers.
+\ifx\havemjocomplex\undefined
+\def\havemjocomplex{1}
+
 
 % The complex conjugate of its argument.
 \providecommand*{\compconj}[1]{ \overline{#1} }
+
+
+\fi