\def\havemjocone{1}
-\usepackage{amssymb} % \succcurlyeq and friends
+\ifx\succcurlyeq\undefined
+ \usepackage{amssymb} % \succcurlyeq, \preccurlyeq
+\fi
-\input{mjo-common}
+\input{mjo-common} % for \of, \Rn, etc.
+\input{mjo-linear_algebra} % \Sn and \Hn
% The dual of a subset of an inner-product space; always a closed
% convex cone.