Good to know that you made it work. It would have been a pain having to go through the GNUstep test suite to verify that the installation works.
Regarding the errors you are getting now, note that the SVN repository does not contain everything required to build Oolite. The oolite.exe depends on a lot of external libraries and obviously we could not put all dependencies on the Oolite tree. We do include, however, a few files that are not part of GNUstep or exist in many different versions, so that all developers refer for example to the same glext.h or libjs32.a. Now, before you go on and build, you need to install the OpenGL headers, the SDL and the SDL_mixer libraries (
http://www.libsdl.org/download-1.2.php) and the libogg library (
http://www.xiph.org/downloads/).
On with the errors:
1. Dumping stack trace.... Not sure what's going on there, but whatever it is it is not good. Looks like the shell is crashing for some reason. I would expect this to go away once your environment has been set up fully.
2. SDL_opengl.h: No such file or directory. Here you are missing the SDL library headers. This will be resolved automagically once SDL has been installed.
3. glext.h:3119: error: syntax error before "red"
The compiler does not know what a GLclampf is. Will be resolved once you have installed the OpenGL headers and libraries on your system.
[Edit] I had a look at the Local.zip file. It seems to contain some of the needed files. It must be just a question of putting them in the right path for the compiler to see them. You can try editing the GNUmakefile and insert the full paths of the files you need to look for. For example, if you want the compiler to see SDL.h and you have installed it in C:/gnustep/headers/SDL, you should append to the ADDITIONAL_INCLUDE_DIRS line
(note the forward slashes).
You seem to have done most of the hard work fine, it should be just a matter of fine tuning the details.