[SOLVED] The compiler can't find `um` in `winapi`

The compiler can't find `um` in `winapi`

I am working on a rust project and trying to get Winapi working.
This is my Cargo.toml:

[package]
name = "sacl"
version = "0.1.0"
edition = "2021"

[dependencies]
winapi = "0.3.5"

And this is my main.rs:

extern crate winapi;

use winapi::um::winnt::*;

fn main() {
    println!("Hello, world!");
}

But for some reason whenever I run cargo build I get the following error:

error[E0433]: failed to resolve: could not find `um` in `winapi`
 --> src/main.rs:3:13
  |
3 | use winapi::um::winnt::*;
  |

I have tried including um as a feature in Cargo.toml since I read that winapi features are gated. Not finding anything about errors with um.

Solution

To use winapi::um::winnt you have to include the feature winnt in your Cargo.toml.

[target.'cfg(windows)'.dependencies]
winapi = { version = "0.3.5", features = ["winnt"] }

The crate uses the last module name as the feature name. So for winapi::winrt::activation you would use activation for the feature.

Appendix cross compilation:

The modules of winapi are only available if cfg(windows) is present due to its conditional compilation. If you target windows but write the source code on a different platform, make sure to setup cross compilation as noted by iceburg in the comment section.