I've got your answer...

BugHunter (and Banfa),

Thanks for pursuing this problem. I just happened to Google the web with the same problem that BugHunter is having. However, I'm building JSBSim in a Microsoft Visual C++ (v7.1) environment.

Here's what's going on:
The file that you are having the problem building is xmltok_ns.c . This is not a "complete" C file, rather it is only part of...