OK, I was interested in using the SDL_net library add on. Downloaded the source and compiled it, unfortunately 'make install' didn't work and I was required to copy the .h files to /usr/include/SDL and the .o to /usr/lib/, however when I go to places->Search for files.. and type "SDL_net.h" for example, it cannot be found. I'm assuming that Ubuntu maintains a file system tree that keeps records of different file locations. How can I update this file system tree?