Under Red Hat Linux, one has to add -L/usr/X11R6/lib to one's makefile
in order to link any program that uses X in any way. This breaks
compatability with all other Unices. A simple solution is to add
/usr/X11R6/lib to the ldscripts for the linker.
The current path compiled into the ldscripts is:
SEARCH_DIR(/lib); SEARCH_DIR(/usr/lib); SEARCH_DIR(/usr/local/lib);