To compile with Linux:
  cc -o xneko -lm -lX11 xneko.c
(You may need ``-Wno-incompatible-pointer-types'' on this)

To compile with XQuartz (Macintosh):
  cc -o xneko -lm -lX11 -I/opt/X11/include -L/opt/X11/lib xneko.c

To compile on NetBSD:
  cc -o xneko -lm -lX11 -I/usr/X11/include -L/usr/X11/lib xneko.c

