-RM = rm -f
-CC = gcc
-CPP = $(CC) -E
-# CC = cc # for HP-UX and others
-
-GAME_DIR = -DGAME_DIR=\".\" # path of the game and its data
-# JOYSTICK = -DNO_JOYSTICK # no joystick
-# SOUNDS = -DNO_SOUNDS # no sounds
-# SCORE_ENTRIES = -DONE_PER_NAME # only one score entry per name
-SCORE_ENTRIES = -DMANY_PER_NAME # many score entries per name
-
-# The XPM-Library is no longer needed to build this program,
-# but is used to load graphics if XPM_INCLUDE_FILE is defined,
-# because the GIF loading routines are still a bit beta.
-# If you use the Xpm library, convert the GIF files to Xpm
-# files (and the mask files ('*Maske.gif') to xbm files).
+ifndef GAME_DIR # path to game data not defined -- try '.'
+GAME_DIR = .
+endif
+
+ifndef SCORE_ENTRIES # number of score entries per player undefined
+SCORE_ENTRIES = MANY_PER_NAME
+endif
+
+
+# The Xpm library is no longer needed to build this program,
+# but is used to load graphics if XPM_INCLUDE_FILE is defined.
+# If you want to use the Xpm library, convert the PCX files to XPM
+# files (and you need corresponding mask files in X11 Bitmap format).