Compiling rust with cpal for raspberry pi - rust

Question

Ok so all I want to do is write an audio application for my raspberry pi. When I compiled a simple "hello world" for raspberry everything worked great but when i introduced cpal as a dependency i got this error after
cargo build --target=armv7-unknown-linux-gnueabihf
error: failed to run custom build command for `alsa-sys v0.1.2`
Caused by:
process didn't exit successfully: `/home/kuba/Projects/effect-box/hello-pi/target/debug/build/alsa-sys-967340f82a5fa569/build-script-build` (exit code: 101)
--- stderr
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: "Cross compilation detected. Use PKG_CONFIG_ALLOW_CROSS=1 to override"', src/libcore/result.rs:1084:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
warning: build failed, waiting for other jobs to finish...
error: build failed
Its been a week and I got nothing. I feel like I've tried everything.
What couses this error and how can I fix it?
Background info: my os is elementary os (it is based on ubuntu so most things that work on ubuntu should work here too) and the code i'm trying to compile is this:
use cpal::traits::{DeviceTrait, HostTrait};
fn main() {
let host = cpal::default_host();
let device = host
.default_output_device()
.expect("no default output device");
let format = device
.default_output_format()
.expect("failed to get device name");
println!("{:?}", format);
println!("Hello, world!");
}
EDIT:
Thanks to Victor Deleau I added an enviroment variable PKG_CONFIG_ALLOW_CROSS=1. Now I'm getting this message:
error: linking with `cc` failed: exit code: 1
followed by this huge error https://pastebin.com/raw/ghHgpesV