The main instructions are in the file INSTALL, in the docs folder. Here is an overview:
First, you'll need LAM, XMPI and wxWindows. The versions I use are LAM-6.5.9, XMPI-2.2.3b6 and wxWindows-2.4.2.
Then, you'll have to patch XMPI and compile it. Then, wXMPI should compile and run without problems. But don't forget to read the file INSTALL.
paulotex at yahoo dot com