capnp-rpc v0.10.0 failed to build

[dwrensha]

Crate name:
capnp-rpc

Build failure link:
https://docs.rs/crate/capnp-rpc/0.10.0/builds/166316

Additional details:
The reported error is

Error while trying to execute `capnp compile`: Failed: No such file or directory (os error 2).  Please verify that version 0.5.2 or higher of the capnp executable is installed on your system. See https://capnproto.org/install.html\" }\', src/libcore/result.rs:999:5\nnote: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

This can happen when the capnp executable is not installed on the system. However, it appears to me that capnp ought to be installed, as capnproto appears in the package list: https://github.com/rust-lang/crates-build-env/blob/9dda900fec0bed82a6f363644dacc00f0554c96a/packages.txt#L11

How can I debug this problem?

...
Actually, looking deeper, apparently at least one previous release succeeded: https://docs.rs/crate/capnp-rpc/0.9.0
Nothing major should have changed since then on my side.
Is it possible that it will work if I try again? Is there a way to try again without releasing a new version?

[jyn514]

@dwrensha The change happened on our side, we switched the builder to use Rustwide: #407. https://docs.rs/crate/capnp-rpc/0.9.0/builds shows it was built before that switch.

I am not sure why capnp is missing, but there are instructions for debugging here: https://github.com/rust-lang/docs.rs/wiki/Making-changes-to-the-build-environment

[dwrensha]

Thanks!
Looks like the latest version succeeded, so I'm not going to worry about it.
https://docs.rs/capnp-rpc/0.11.0/capnp_rpc/