No such module PackageDescription error

[pedrovgs]

First of all, thank you for all the open-source repositories in relation to Swift-on-Android. It's just awesome!!

I'm trying to use this toolchain for a prototype and unfortunately I can't get it working. I followed the instructions from the readme but creating an empty Swift Package and running swift-build from the root folder returns this error:

Package.swift:6:8: error: no such module 'PackageDescription'

I'm checking if there is a problem with the toolchain but I think is ok. This is the version I'm using:

swift-build --version
Swift Package Manager - Swift 5.4.0

The project is just a library created with XCode where I just changed the Package.swift to use swift 5.4 instead of 5.8.

This is the Package.swift content:

// swift-tools-version: 5.4
// The swift-tools-version declares the minimum version of Swift required to build this package.

import Foundation
import PackageDescription

let package = Package(
    name: "DemoLibrary",
    products: [
        // Products define the executables and libraries a package produces, and make them visible to other packages.
        .library(
            name: "DemoLibrary",
            targets: ["DemoLibrary"]),
    ],
    dependencies: [
        // Dependencies declare other packages that this package depends on.
        // .package(url: /* package url */, from: "1.0.0"),
    ],
    targets: [
        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
        // Targets can depend on other targets in this package, and on products in packages this package depends on.
        .target(
            name: "DemoLibrary",
            dependencies: []),
        .testTarget(
            name: "DemoLibraryTests",
            dependencies: ["DemoLibrary"]),
    ]
)

Is maybe something I'm missing? Maybe I should use the release for Swift 5.7 instead? I've seen there is a release branch but I don't know if this is ready right now.