these targets are supported in compile time:

QNX	makefile.qnx	->	Watcom C++ 10.6 for QNX
	- banked mode
	makefile.qcc	->	GNU C++ QNX
	- banked mode

DOS	makefile.wcc	->	Watcom C++ 10.6 for DOS
	- banked mode
	makefile.dj	->	DJGPP 2.x
	- banked mode
	makefile.d16	->	DJGPP 2.x
	- linear 16 bit colors mode
	makefile.d32	->	DJGPP 2.x
	- linear 32 bit colors mode

LINUX	makefile.lin	->	GNU C++ 2.7.2 & above
		for kernels 2.0.x is SVGALIB support only in banked (& linear mode if
		your card supports them).
		for kernels 2.2.x is supported linux fbdev also
	makefile.l16	->	force 16 bit colors, linear
	makefile.l32	->	force 32 bit colors, linear
		for kernels 2.2.x only, linear mode & TRUE_COLORS
	makefile.gl	->	to compile with Mesa3D in 8  bit colors
	makefile.gl2	->	to compile with Mesa3D in 32 bit colors

