G'day Discipulus,

Thanks for the follow-up. While it's clear the OP was using Windows, I wasn't aware that this was a Windows-specific problem: I don't see anything like "This worked on XYZ, but not on Windows".

I'm using:

Perl 5.26.0 (built for darwin-thread-multi-2level)
Parallel::ForkManager 1.19
LWP::Simple 6.26
[download]

I had to install Parallel::ForkManager and the cpan output is still on one of my screens. Here's my equivalent lines to those you posted:

t/00-report-prereqs.t ..... ok
t/01-utf8-all.t ........... skipped: Need utf8::all for this test cras
+hing on Windows
# This test can take 10-20 seconds, please wait. Started at Thu Sep 21
+ 17:07:29 2017
t/02-callback.t ........... ok
# This test can take 2-6 seconds, please wait. Started at Thu Sep 21 1
+7:07:45 2017
t/03-callback-data.t ...... ok
t/basic-methods.t ......... ok
t/changing-pids.t ......... ok
t/start_child.t ........... ok
# code outside of P::FM stole 2369
child process '2369' disappeared. A call to `waitpid` outside of Paral
+lel::ForkManager might have reaped it.
t/waitpid-conflict.t ...... ok
# code outside of P::FM stole 2371
t/waitpid-waitonechild.t .. ok
t/waitpid_blocking.t ...... ok
All tests successful.
[download]

You appear to have had problems with t/waitpid-waitonechild.t that I didn't have; everything else looks fairly similar.

To be honest, I started the installation, went and made a coffee, came back and saw:

  YANICK/Parallel-ForkManager-1.19.tar.gz
  /usr/bin/make install  -- OK

cpan[2]>
[download]

I rarely review the (often many screenfuls of) output unless the installation failed.