Can't build in Xcode (Redefinition of module 'FFI' error)

[inamiy]

Describe the bug

After making a new project from a template, building from Xcode (not carton dev) fails with the following error:

This error becomes annoying when I want to support Tokamak for my SwiftUI library.

To Reproduce

1. carton init --template tokamak
2. Build from Xcode

Expected behavior

1. Xcode build works properly, or
2. Have some way to optionally add Tokamak as dependency in library's Package.swift so that carton dev recognizes its condition but Xcode build won't. For example:

let package = /* My SwiftUI library */

// Carton recognizes this condition but Xcode (or non-SwiftWasm `swift build`) won't.
if ProcessInfo.processInfo.environment["CARTON"] != nil {
    package.dependencies.append(
        .package(url: "https://github.com/TokamakUI/Tokamak", from: "0.10.0")
    )

    let index = package.targets.firstIndex(where: { $0.name == "MyLib" })
    if let index = index {
        package.targets[index].dependencies.append(
            .product(
                name: "TokamakShim",
                package: "Tokamak",
                condition: .when(platforms: [.wasi])
            )
        )
    }
}

Desktop (please complete the following information):

• OS: macOS 12.4
• Version of Tokamak: 0.10.1