This is really an X11 R4 game, but luckily it can be compiled
for an R3 server. You need some Athena widgets and Xmu routines
however. These are available separately.

Procedures are provided for compiling and linking:
MAKEFILE.COM and LINK.COM.

To get this to compile, I used a definition of X11 as follows:
   "X11" = "X_LIB" (LNM$PROCESS_TABLE)
	= "DECW$INCLUDE"
	= "X_MIT"
	= "XAW"
1  "X_LIB" = "DUA0:[X.LIB.]" (LNM$PROCESS_TABLE)
1  "DECW$INCLUDE" = "SYS$COMMON:[DECW$INCLUDE]" (DECW$LOGICAL_NAMES)
1  "X_MIT" = "X_ROOT:[INCLUDE]" (LNM$PROCESS_TABLE)
1  "XAW" = "X_ROOT:[LIB.XAW]" (LNM$PROCESS_TABLE)

This includes just about every directory where a .h file could
possibly live!

You can adjust the parameters of the game using resource names.
Look in xinvaders.ma for instructions. (Yes it is ".ma", not ".man".
Ask the author why ...)

There is a sample file provided called xinvaders.ad which makes
the game almost playable on a VAXstation 2000. Unfortunately,
my machine does not quite have enough grunt. Your milage may
vary ...

To set the resources, use:
	$ xrdb -merge xinvaders.ad

The game loads the bitmaps "on the fly", so you really need
to set default to the correct directory before running it.

There is one obvious bug -- the score does not appear inside
the initial window. If you enlarge the window you will find
it, but then the game may do strange things.

I guess the main thing about this game is that we can finally
say "we've got Space Invaders too!". Otherwise, it is a bit of
a washout.

	Trevor Taylor
	September 1990