How do I install Darwin 13 on OS X 10.9.1? I've recently bought a MacBook with OS X 10.9 and I've just updated it to 10.9.1 (x86_64-apple-darwin10.8.0 64-bit).

I'd like to install the version 13 of Darwin.

I've done everything proposed by this website, but when I try to make xnu, I have this error message:

Generating libkern/version.h from /Users/xxxx/Downloads/xnu-2422.1.72/libkern/libkern/version.h.template
install: target ‘version.h’ is not a directory
make[5]: *** [version.h] Error 1
make[4]: *** [build_exporthdrs_mi] Error 2
make[3]: *** [build_exporthdrs_mi_recurse_into_libkern] Error 2
make[2]: *** [build_exporthdrs_mi_recurse_into_libkern] Error 2
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [build_exporthdrs_mi_bootstrap_RELEASE^X86_64^NONE] Error 2
make: *** [all] Error 2
The problem is somewhere with my bash (I've brewed some GNU utils, it is maybe it). So, I've used zsh and the makecommand compiled great!