https://ci.debian.net/data/autopkgtest/testing/amd64/r/rust-esaxx-rs/63294253/log.gz

...
 44s warning: esaxx-rs@0.1.10: Compiler family detection failed due to error: ToolNotFound: failed to find tool "c++": No such file or directory (os error 2)
 44s error: failed to run custom build command for `esaxx-rs v0.1.10 (/usr/share/cargo/registry/esaxx-rs-0.1.10)`
...
 61s autopkgtest [21:20:54]: @@@@@@@@@@@@@@@@@@@@ summary
 61s rust-esaxx-rs:@      FAIL non-zero exit status 101
 61s librust-esaxx-rs+cc-dev:cpp FAIL non-zero exit status 101
 61s librust-esaxx-rs+cc-dev:default FAIL non-zero exit status 101

We believe that the bug you reported is fixed in the latest version of
rust-esaxx-rs, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1111979@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Kohei Sendai <kouhei.sendai@gmail.com> (supplier of updated rust-esaxx-rs package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Mon, 01 Sep 2025 11:41:13 -0400
Source: rust-esaxx-rs
Architecture: source
Version: 0.1.10-2
Distribution: unstable
Urgency: medium
Maintainer: Debian Rust Maintainers <pkg-rust-maintainers@alioth-lists.debian.net>
Changed-By: Kohei Sendai <kouhei.sendai@gmail.com>
Closes: 1111979
Changes:
 rust-esaxx-rs (0.1.10-2) unstable; urgency=medium
 .
   * Add g++ on autopkg depend. (Closes: #1111979)
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 947b8bedea4fcb611eb1a0f5210339d74aa19d0f 3272 rust-esaxx-rs_0.1.10-2.debian.tar.xz
 eb1fe8301c80e6058f566e2aee72eeeec3f09878 7338 rust-esaxx-rs_0.1.10-2_source.buildinfo
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Files:
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