How can I build programs(such as busybox) in GNU/kFreeBSD?

[panxj]

Hi,all:
        I installed the system and apt-get gcc and make. Now I tried to do some development work on GNU/kFreeBSD, but can't find the headerf files. I tried to use the standard glibc, but fails. Where can I find them? And is there any thing I should take care of?
        I'm eager for your help!
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