Pgk-config and rust 01.03.25

pkg-config helps you find the needed libs to build

## Requirements
```
sudo apt install libgtk-4-dev build-essential
```

## Project Setup
```
cargo new my-gtk-app
cd my-gtk-app
pkg-config --modversion gtk4
cargo add gtk4 --rename gtk --features v4_8
```

## Hello World Code
```
use gtk::prelude::*;
use gtk::{glib, Application, ApplicationWindow, Button};

const APP_ID: &str = "org.gtk_rs.HelloWorld2";

fn main() -> glib::ExitCode {
    // Create a new application
    let app = Application::builder().application_id(APP_ID).build();

// Connect to "activate" signal of `app`
    app.connect_activate(build_ui);

// Run the application
    app.run()
}

fn build_ui(app: &Application) {
    // Create a button with label and margins
    let button = Button::builder()
        .label("Press me!")
        .margin_top(12)
        .margin_bottom(12)
        .margin_start(12)
        .margin_end(12)
        .build();

// Connect to "clicked" signal of `button`
    button.connect_clicked(|button| {
        // Set the label to "Hello World!" after the button has been clicked on
        button.set_label("Hello World!");
    });

// Create a window
    let window = ApplicationWindow::builder()
        .application(app)
        .title("My GTK App")
        .child(&button)
        .build();

// Present window
    window.present();
}

```

https://gtk-rs.org/gtk4-rs/git/book/hello_world.html

Anonymous

Pgk-config and rust 01.03.25

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