Given following log snippets, their explanation, and nothing else, explain what failure, if any, occurred during build of this package.

  Snippets are in a format of [X] : [Y], where [X] is a log snippet, and [Y] is the explanation.

  Snippets are delimited with '================'.

  Drawing on information from all snippets, provide a concise explanation of the issue and recommend a solution.

  Explanation of the issue, and recommended solution, should take a handful of sentences.

  Snippets:

  [
#   Failed test 'did not search PATH for C++ compiler when given absolute path to C compiler'
#   at t/03-cplusplus.t line 73.
#          got: 'g++'
#     expected: '/builddir/build/BUILD/perl-5.41.13-build/perl-5.41.12/dist/ExtUtils-CBuilder/some/directory/what/doesnt/exist/cc'
# Looks like you failed 1 test of 7.
../dist/ExtUtils-CBuilder/t/03-cplusplus.t ........................... 
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/7 subtests ]: [Here build failed, because test got different result as expected]

Issue: The test failed because it did not expect $ENV{CXX}, and consequently $cb->{config}{cxx}, to be defined at runtime.
https://github.com/Perl/perl5/issues/23277
Resolution: There are two way how to solve it.
The test should be skipped entirely if $CXX is set, or $CXX needs to be (temporarily) unset.
