Ok, I finally found the problem. I told you wrong before, I had a *.c file in my project... the sqlite3 library...
I don't know why, but if I remove all the sqlite3 *.c files from the project it compiles well.
There's another problem. I think it's because I compiled wxWidgets on my own:
The program compiles but when I'm trying to run it, there's message box telling me that the "wxmsw28d_gcc_custom.dll" and "wxmsw28_gcc_custom.dll" are missing. Could it be about changed paths or something? May I fix this per hand or do I have to redo the project (or atleast create a new project and copy my files)?
Greets,
mkd
#edit: I just tried to create a new project with the wxWidgets wizard, this isn't working too. There's this message box telling me that there weren't found any matching files to compile a debug or release version.