shared installation support

[kennethnym]

Is your feature request related to a problem? Please describe.

add the ability to use a shared zeromq installation instead of the vendored binary.
given that zmq_shared used to be an option, it would be great if it could be brought back.

Describe the solution you'd like

an opt-in build flag to enable the use of shared installation of libzmq.

Describe alternatives you've considered

there is no alternative as far as i know.

Additional context

i am in the process of submitting prime-agent to homebrew-core (pr here). it is against the brew guideline to statically vendor dependencies when there is a formula for it:

A separate project should not be bundled when a maintained Homebrew formula can provide the same dependency. Unnecessary vendoring makes security updates harder and can leave multiple outdated copies installed.
Vendored dependencies may be eligible when upstream’s supported build cannot use the system dependency or unbundling would make the formula unreliable. The exception must be visible and the vendored components must be updated with each release.

• https://docs.brew.sh/Acceptable-Formulae#vendored-dependencies

[aminya]

You can provide the zmq_shared option in npmrc. Although, it's not tested recently. Feel free to make a PR if it doesn't work as expected.

P.S: this homebrew policy is unacceptable. They're basically ruling out the whole native Node addon ecosystem by imposing restrictions that are impractical in many situations.

[aminya]

I will publish the new zeromq by tomorrow. I'll use the binaries from the last release to de-risk the release. Only the cmake change will ship to the users.

[kennethnym]

sounds good thank you so much!

[kennethnym]

just checking in - has the release been published?

[aminya]

Published in https://github.com/zeromq/zeromq.js/releases/tag/v6.6.0

[kennethnym]

amazing, thank you so much!