The command that starts the compilation of Xfree86 on Unix systems, upon which invocation the compiler will begin tormenting your CPU with line after line of source code it wants to convert into a nice, big, machine executable programs which will allow you to have a GUI with its 16 million colours and different types of fonts*(**) that are more interesting than the white-on-black single-font alternative.

Also perhaps what God typed in on the 2nd day of creation, if it's finally proven that he's really a programmer.

* Some more assembly (e.g. writing of config files) required.
** If no "make: ***install Error 2" or something similar shows up.