compile-time-run
This crate contains macros to run commands on your system during compile time. It can be used in some situations to take over functionaility that would otherwise have to be done using a build script.
An example:
use ;
const VALUE_STR : &'static str = run_command_str!;
const VALUE_BYTES : &'static = run_command!;
Keep in mind that running abitrary commands during your build phase can easily hurt portability.