do not have /usr/X11R6 for quite a long time)
- Move the options block lower within the Makefile
- Add missing USE_XORG as reported by `stage-qa'
- Provide sensible description for LIBNOVA option
- Remove MONOCHROME option: the program does not run
properly with it ("Fatal Error! No visuals that we
can use") and monochrome mode can be enabled by
launching it with `-m' switch
- Convert to option helpers, use INSTALL_DATA for
installing documentation files, not INSTALL_MAN
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