Hi newperldeveloper,

The PDL::Graphics::PLplot distro is cunningly designed to play tricks. Here's what I get on Ubuntu-18.04, perl-5.32.0: 
$ cpanm -i PDL::Graphics::PLplot
--> Working on PDL::Graphics::PLplot
Fetching http://www.cpan.org/authors/id/D/DH/DHUNT/PDL-Graphics-PLplot
+-0.74.tar.gz ... OK
Configuring PDL-Graphics-PLplot-0.74 ... OK
Building and testing PDL-Graphics-PLplot-0.74 ... OK
Successfully installed PDL-Graphics-PLplot-0.74
1 distribution installed
$

[download]
But then: 
$ perl -MPDL::Graphics::PLplot -le 'print "ok";'
Can't locate PDL/Graphics/PLplot.pm in @INC (you may need to install t
+he PDL::Graphics::PLplot module) (@INC contains: /home/sisyphus/perl-
+5.32.0-d/lib/site_perl/5.32.0/x86_64-linux /home/sisyphus/perl-5.32.0
+-d/lib/site_perl/5.32.0 /home/sisyphus/perl-5.32.0-d/lib/5.32.0/x86_6
+4-linux /home/sisyphus/perl-5.32.0-d/lib/5.32.0).
BEGIN failed--compilation aborted.

[download]
Turns out that I don't have the plplot library installed.
The PDL-Graphics-PLplot distro is designed to fool the cpan and cpanm utilities into thinking that the build was a success, even when it failed.
The cpan utility makes things a little more apparent: 
$ cpan -i PDL::Graphics::PLplot
Loading internal logger. Log::Log4perl recommended for better logging
Reading '/home/sisyphus/.cpan/Metadata'
  Database was generated on Thu, 20 Aug 2020 00:17:03 GMT
Running install for module 'PDL::Graphics::PLplot'
Checksum for /home/sisyphus/.cpan/sources/authors/id/D/DH/DHUNT/PDL-Gr
+aphics-PLplot-0.74.tar.gz ok
'YAML' not installed, will not store persistent state
Configuring D/DH/DHUNT/PDL-Graphics-PLplot-0.74.tar.gz with Makefile.P
+L
PDL is installed

Checking PDL::Graphics::PLplot...
Searching for libplplot.so library.
Searching for libplplotd.so library.
Cannot find plplot library (libplplotd.so), skipping PDL::Graphics::PL
+plot

      Not building PDL::Graphics::PLplot


Cannot find plplot library (libplplotd.so), skipping PDL::Graphics::PL
+plot      Not building PDL::Graphics::PLplot
Checking if your kit is complete...
Looks good
  DHUNT/PDL-Graphics-PLplot-0.74.tar.gz
  /home/sisyphus/perl-5.32.0-d/bin/perl Makefile.PL -- OK
Running make for D/DH/DHUNT/PDL-Graphics-PLplot-0.74.tar.gz
Could not read metadata file. Falling back to other methods to determi
+ne prerequisites
make: Nothing to be done for 'all'.
  DHUNT/PDL-Graphics-PLplot-0.74.tar.gz
  /usr/bin/make -- OK
The current configuration of allow_installing_outdated_dists is 'ask/y
+es', but for this option we would need 'CPAN::DistnameInfo' installed
+. Please install 'CPAN::DistnameInfo' as soon as possible. As long as
+ we are not equipped with 'CPAN::DistnameInfo' this option does not t
+ake effect
Running make test for DHUNT/PDL-Graphics-PLplot-0.74.tar.gz
make: Nothing to be done for 'test'.
  DHUNT/PDL-Graphics-PLplot-0.74.tar.gz
  /usr/bin/make test -- OK
Running make install for DHUNT/PDL-Graphics-PLplot-0.74.tar.gz
make: Nothing to be done for 'install'.
  DHUNT/PDL-Graphics-PLplot-0.74.tar.gz
  /usr/bin/make install  -- OK

[download]
See ? Everything went fine, including /usr/bin/make install ;-)

So, I'm thinking that you, too, might not have the plplot library installed.
If that's not the case, let me know how I can get apt-get to install the plplot library on Ubuntu and I'll investigate your problem further.

Cheers,
Rob

In reply to Re^3: PDL::Graphics::PLplot fails on install by syphilis
in thread PDL::Graphics::PLplot fails on install by newperldeveloper

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