Hi!
My guess is that you did not get the setup.h step right; but in any case, like all things digital, compiling is a very tricky thing to get right the first time! First, read this thread:
https://forum.audacityteam.org/t/solved-trouble-compiling-audacity-from-svn-with-asio/18248/1
ignore the ASIO stuff but go back and re-do the wxWidgets stuff following all directions very carefully. Compile and run some of the wxWidgets test apps–do they all run–if so go on and compile the Audacity SVN HEAD. If you get any errors something is wrong with your environment.
If you run into more questions just ask!