ARM-ELF编译u-boot出错

请问我在编译u-boot时出现一下错误，是怎么回事？
jasminetea@lrl /u-boot
$ make
make[1]: Entering directory `/u-boot/tools'
make[1]: `.depend' is up to date.
make[1]: Leaving directory `/u-boot/tools'
make[1]: Entering directory `/u-boot/examples'
make[1]: `.depend' is up to date.
make[1]: Leaving directory `/u-boot/examples'
make[1]: Entering directory `/u-boot/post'
make[1]: `.depend' is up to date.
make[1]: Leaving directory `/u-boot/post'
make[1]: Entering directory `/u-boot/post/cpu'
make[1]: `.depend' is up to date.
make[1]: Leaving directory `/u-boot/post/cpu'
make -C tools all
make[1]: Entering directory `/u-boot/tools'
make[1]: *** No rule to make target `/usr/lib/gcc/i386-redhat-linux/4.1.1/includ
e/stddef.h', needed by `img2srec.o'.  Stop.
make[1]: Leaving directory `/u-boot/tools'
make: *** [tools] Error 2
用的工具是arm-elf，在cygwin下