Multilib in opam external dependecies

Ecosystem
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1

I need to specify on Ubuntu some packages with ‘:i386’ suffix, because I want to use system cross compiler. I tried to do exactly that but it seems that opam complains that these packages are not installable (but they should be). I also grepped opam repository and it seems that nobody uses that feature. Any ideas?

[ERROR] Package Lama.dev depends on the unavailable system package
        'linux-libc-dev:i386'. You can use `--no-depexts' to attempt installation
        anyway.
2

At the moment opam doesn’t support that particular feature for the depexts on Debian based systems. Could you open a feature request on the opam bug-tracker?

In the meantime you could add a post-messages field to your opam file and invite your users to install that package if {failure & (os-family = "debian" | os-family = "ubuntu")} or something like that