I gave it a whirl:
> git clone https://github.com/denoland/deno.git denoland/deno
> git clone https://github.com/denoland/rusty_v8.git denoland/rusty_v8
> cd denoland/deno
> vi Cargo.toml
...
[patch.crates-io]
rusty_v8 = { path = "../rusty_v8" }
...
> cargo build --release
... as expected same failure - good ...
Make rusty_v8 build.rs aware of freebsd
> vi ../rusty_v8/build.rs
...
#[cfg(target_os = "freebsd")]
{
"freebsd"
}
...
Have a quick squizz to see where this is used:
> rg "platform\(\)" ../rusty_v8
build.rs
157:fn platform() -> &'static str {
180: .join(platform());
Attempt to fix... and bang! It's using the platform() result to call a python script that pulls binaries from here:
https://github.com/denoland/ninja_gn_binaries/
And there's no FreeBSD build there. To much yak shaving for idle curiosity on my part.