What do you mean with nothing happens ?
Where did you add what ?
Do you set the global variable $(#glfw) in the global variables dialog or do you add the appropriate directory ( /usr ) directly in the textbox of the wizard ?
In the first case yo should have $(#glfw.lib) and $(#glfw.include) as searchdirectories for linker and compiler, in the second case, they should be /usr/lib and /usr/include .