Ok, figured I'd see if I can get it built, and if so, perhaps trying to contribute. Windows build environment, and I followed Compile for Windows (Easy Way) and Code::Blocks setup to a 'T' (using provided zip file). Performed a workspace cleaning, followed by a workspace build. Below is symptom, and steps I used to fix it, including intermediate steps that didn't work.
src\common\xml.h
line 24: include <mxml.h>
errors out, can't find file...
line 24: #include "../libs/mxml/mxml.h"
allowed it to compile perfectly fine
ld then fails with 'cannot find -lmxml
So... a look around, and there's no library to link against that I can find.
I meandered over to
http://www.minixml.org/ and grabbed a copy of 2.6, and went ahead and fired up msys in the MinGW directory, and configured and built it. Copied the new config.h for mxml over to %USER%\ufoai\src\libs\mxml. Took the resulting libmxml.a and threw it in c:\development\codeblocks\MinGW\lib. Rebuilt the workspace, and failed miserable, this time with undefined reference to `_imp__pthread_once' (and a few more pthread related entries).
Went back, and hand edited the config.h file to remove pthread support (since reading over it, it supports building without it). Remade libmxml.a, and copied it over again, as well as the hand edited config.h file to their respective folders. Rebuilt the workspace again, and it completed. The one that finally built after all that trouble was testall.exe.
For completeness sake, went ahead and did a workspace clean, then build again... and just got a ton of warnings, and no errors. All this added troubleshooting info isn't probably that needed, but if I'm going to take a crack at contributing, might as well show I'm not a total newbie on my very first issue with the source.
To make the fix a permanent feature, probably want to add libmxml to the codeblocks premade zip file instead of in the ufoai source... especially since the source version doesn't have the configure script or makefile to build the needed library with.
(Anyone that skips straight to a TLDR wants the least possible, so no punctuation for you...)
------
TLDR: libmxml is missing from mingw so workspace building fails and how i fixed it and if you want to know how read the rest of the post