Can't find create for std

Ah ha! But you got me on the right track!

Here's how I got rust installed from these tarballs:

$ tar -zxf rust-nightly-x86_64-unknown-linux-gnu.tar.gz
$ tar -zxf rust-std-nightly-x86_64-unknown-linux-gnu.tar.gz 
$ mv rust-std-nightly-x86_64-unknown-linux-gnu/rust-std-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/ rust-nightly-x86_64-unknown-linux-gnu/rustc/lib/rustlib/
$ cd rust-nightly-x86_64-unknown-linux-gnu/rustc/
$ env LD_LIBRARY_PATH=lib bin/rustc

So thank you! Your information was very useful!