Makefile文件中的问题

01426063

TOOLPATH_BULVERDE= /usr/local/arm/3.3.3/bin
TOOLPATH_OMAP= /usr/local/arm/3.3.2/bin
TOOLPATH_LUBBOCK= /usr/local/arm-linux/bin
TOOLPATH_MIPS= /opt/toolchain/mipsout/bin


KERNELVERSION_X86:= $(shell uname -r)
KERNELVERSION_MIPS= 2.4.20-wel4-mips


BULVERDE_DIR= /tftpboot/bulverde/root
OMAP_DIR= /tftpboot/omap1510/root
MIPS_DIR= /tftpboot/mips/root
...............
请问这几行代码什么意思?我要在我的linux下编译文件, 是不是要改这些东西?