Put \ifx guards on most other package includes, too.

[mjotex.git] / mjo-arrow.tex

diff --git a/mjo-arrow.tex b/mjo-arrow.tex
index 4dd5f88bc6053dd224dd3c7b138ff757c78fe301..60530cb71020f3902e3b4c11f9a6498814241f5e 100644 (file)
--- a/mjo-arrow.tex
+++ b/mjo-arrow.tex
@@ -5,7 +5,11 @@
 \def\havemjoarrow{1}
 
 
-\input{mjo-common}
+\input{mjo-common} % for \of, at least.
+
+\ifx\operatorname\undefined
+  \usepackage{amsopn}
+\fi
 
 % The identity operator/arrow on its argument.
 \newcommand*{\identity}[1]{ \operatorname{id}_{{#1}} }