uclibc-ng/libc/sysdeps

This directory level abstracts out the UN*X-like Operating System dependent
features of uC-Libc for all UN*X-like operating systems. If you wanted to port
uC-Libc to some other UN*X-like OS, this is the place to add that support.

If you want to port uC-Libc to support some non-UN*X-like Operating System, you
should probably stop using crack. It is bad for you. ;-)