Hmmm not sure I'm understanding what you mean about the ones with #include not working - is that all of the ones that have separate class files (which would be a lot of them)? It's probably just a matter of making sure everything is in the right place in the project.
NOC8_9__Simple_L_system_sent & NOC9_1__Genetic_algorithm__Evo actually don't have any output in the main window, I should have included a comment about that. They're just conceptual exercises which output in the console, but could easily be extended to produce visual output. The L system produces a new generation in the console each time you click the main window with the mouse ... also the string grows exponentially so if you do it enough times it will crash!
I'm not sure why the Neural Network one isn't producing output for you, I'm getting similar results to Example 10.4 here: http://natureofcode.com/book/chapter-10-neural-networks/ ... did you copy the ofApp.cpp file into the project?