菜鸟求助~~~~编译uClinux的问题~~~~~~~~

在busybox下make后出现：
Trying libraries: crypt m
Library crypt is not needed, excluding it
Library m is needed, can't exclude it (yet)
Final link with: m
libbusybox: 0_lib/libbusybox.so.1.19.3
busybox linked against libbusybox: 0_lib/busybox
Linking individual applets against libbusybox (see 0_lib/*)
DOC busybox.pod
DOC BusyBox.txt
DOC busybox.1
DOC BusyBox.html

make install后出现：
--------------------------------------------------
You will probably need to make your busybox binary
setuid root to ensure all configured applets will
work properly.
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编译器是gcc-3.4.6-2f 中的mipsel-linux，而且没有生成usr目录