the ECHO macro is set to "echo" by default, but it is set to "true" if
make(1) is invoked with the -s option while ECHO_CMD is always set to
the echo command.
Use command macros where appropriate.
Software (demo version). The game was not personally tested by me,
but I figured we should have a port available for those who wish to
try to get it working with their video card.
PR: 23507
Submitted by: Marc van Woerkom <3d@FreeBSD.org>