Installation of 2 module prerequisites failing - using cpanm

[Intrepid]

Hi Monks. I don't know if anyone can help me with this, but I'll ask anyhow.

I'm doing this on the commandline:

$ PERL5LIB=~/build/perl-testing-libs/lib/perl5 cpanm --self-contained \
--exclude-vendor -L ~/build/perl-testing-libs --wget --skip-satisfied \
--interactive --verbose YAML::LibYAML

The resulting message is

! Installing the dependencies failed: Module 'Test::More' is not installed
! Bailing out the installation for File-Temp-0.2312.
! Installing the dependencies failed: Module 'File::Temp' is not installed

When I try to build the two required modules alone, I can't get a succcessful installation. What's going on?

EDIT

Sorry,I was tired and in a hurry and didn't give much contextual info. My System and my Perl are:
OS: CYGWIN_NT-10.0-26200; cpu type: x86_64; |12| cores, cpus present: |1|
Perl version v5.40.3, CygPerl.

    – Soren

Apr 28, 2026 at 21:46 UTC

[tobyink]

File::Temp has been bundled with Perl since Perl 5.6.1 was released more than a quarter of a century ago.

Test::More has been included since 5.6.2, almost as long ago.

If your Perl installation cannot find these modules, there are likely deeper issues at play.

[Corion]

I think part of it is the use of --self-contained, while also not having the core modules available maybe due to overriding PERL5LIB and Perl itself not supplying the correct path, maybe due to running a Win32 Perl while expecting a Cygwin Perl.

[LanX]

Hi tobyink

You haven't been here for a while, welcome back! :)

So you know

> likely deeper issues at play

Multiple conflicting Perl installations and messed up environment variables are a recurring theme in many posts of this particular monk.

Compare last 2 years of threads by this OP (click search)

[Intrepid]

Rolf wrote:

Multiple conflicting Perl installations and messed up environment variables are a recurring theme in many posts of this particular monk.

That's not entirely valid and really a bit unfair. Your characterization might lead to other monks ignoring my posts, and that's a pretty negative effect in my view of how perlmonks should be.

I am capable of learning from past mistakes and absorbing advice from the monks, thus the frequency of these "weird problems" has dropped drastically.

What's accurate and true is that my Windows systems are (mostly) working fine and I am aware of and in control of all env vars*, $PATH, etc. I've stopped using StrawberryPerl entirely and am focused completely on CygPerl at present. I also use Gnu/Linux systems and usually compare problems when they come up to see if I can reproduce the difficulty on Linux.

* My CPAN module helps me with that.

    – Soren
May 02, 2026 at 16:52 UTC

[bliako]

When I try to build the two required modules alone, I can't get a succcessful installation.

well, show us the errors of installing the 2 required modules. Unless you mean you installed the 2 modules successfully but still no joy for the target module. In which case, check your include dirs or whether you used different perl versions (via perlbrew), etc. etc. Check if the path ~/build/perl-testing-libs/lib/perl5 contains the 2 dependencies. Should that -L contain lib/perl5? I am not acquainted with this option.