Well, there already _is_ nfs mount code in busybox, but it was configured away, because it needs the SUN RPC library, which is missing from Android / Bionic. That issue would probably also exist for mount.nfs from other sources, which would most likely also need additional porting work. Thus, I snatched the librpc code from uClibc today, and meddled with it until it compiled in my copy of the CM9 sources. Got it to work! I can now NFS mount on my GNex, and the freshly built and installed update.zip was cop

Source: How can I mount a NFS share? – Page 2