[Tex/LaTex] how to get the ws-procs9x6 document class to work with subcaption package

Question

I have a problem concerning the ws-procs9x6 document class furnished by a conference.

I can't get it work with the caption & subcaption or even subfig packages to work with it, which is a problem as I can't place my figures in my paper.

Do you know how to make it work?

The error I get is:

Command \captionbox already defined. \caption@withoptargs\caption@box}"
and "Unsupported document class (or package) detected,(caption) usage of the caption package is not recommended."

Here's a simple code :

\documentclass{ws-procs9x6}
\usepackage{subcaption}

\begin{document}
\begin{figure}
\psfig{file=coucou.eps,width=4.5in}
\caption{Coucou}
\label{fig:coucou}
\end{figure}
\end{document}

Answer 1

The caption package is not compatible with the ws-procs9x6 class, which defines its own caption style; since the class is required for submissions to a publisher, it's highly recommended not to tamper with their style.

However, the subfig package turns out to be compatible with the class, provided it's loaded without caption:

\usepackage[caption=false]{subfig}

An example:

\documentclass{ws-procs9x6}

\usepackage[caption=false]{subfig}

\begin{document}
\begin{figure}
\centering
\subfloat[abc]{xxxxxxxxxxxxxx}\quad
\subfloat[abc]{xxxxxxxxxxxxxx}
\caption{Coucou}
\label{fig:coucou}
\end{figure}
\end{document}