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	(CPU,CONFIG_H,OS_TYPE): Defined.
	(INCLUDE,LIB): Checked if valid.
	(ntwin32.mak): Included.
	(AR,CC,LINK): New definition.
	(ADVAPI32,libc,BASE_LIBS): Defined.
	(SYS_LDFLAGS): New definition.
	Update comments and preprocessor conditionals.
	(SYS_LIB_DIR,SYS_INC_DIR): Undefined.