What that means is that you need to know what library the function is in. To use the example from your last thread, not all GTK functions are in glib. Some are in gthread, some are in gmodule, etc. I don't know if GTK has their act together enough to have man pages; if so, that's ideal -- just do "man functionname" and it will tell you what library the function is in. Otherwise you'll have to check the docs that came with the library you're trying to use.
