Runtime library paths

The last configuration option is rpath. This configuration item accepts a Boolean and allows you to ask the Rust compiler to set loader paths when the executable looks OK for libraries at runtime. Even though, most of the time, Rust will link crates and libraries statically, you can ask a specific library to be linked dynamically. In this case, that library will be searched at runtime, not at compile time, and it will therefore use system libraries installed where the program is running.

This configuration option asks cargo to add -C rpath to the rustc compiler invocation. This will add paths to the dynamic library search paths. Nevertheless, this should not be required in most cases, and you should avoid it if it's not necessary by using false as the option value. If you are having issues making your application run in multiple operating systems, you might try it, since it might make the executable look for dynamic libraries in new places.