Red Hat 8 and CentOS 8 support

perl-PDF-API2 is not needed since LPAR2RRD v7.80+

RHEL8 and CentOS8 standard repositories do not contain perl-PDF-API2 package with its dependencies.
You have to download and install them manually via bellow packages, when it does not work use cpan method bellow.

Manual install

Download Site: www.city-fan.org/ftp/contrib/yum-repo/rhel8/x86_64/
www.city-fan.org/ftp/contrib/yum-repo/rhel8/x86_64/perl-Graphics-TIFF-6-4.el8.x86_64.rpm
www.city-fan.org/ftp/contrib/yum-repo/rhel8/x86_64/perl-PDF-API2-2.033-6.el8.noarch.rpm
www.city-fan.org/ftp/contrib/yum-repo/rhel8/x86_64/perl-Font-TTF-1.06-8.el8.noarch.rpm

RHEL 8: enable the codeready-builder-for-rhel-8-*-rpms repository

# ARCH=$( /bin/arch )
# subscription-manager repos --enable "codeready-builder-for-rhel-8-${ARCH}-rpms"

# yum config-manager --set-enabled PowerTools
or
# dnf config-manager --set-enabled powertools

Install SNMP and PDF support packages already downloaded localy:

# umask 0022
# yum install perl-PDF-API2-2.033-6.el8.noarch.rpm perl-Font-TTF-1.06-8.el8.noarch.rpm perl-Graphics-TIFF-6-4.el8.x86_64.rpm

CPAN

# Prerequsites
umask 022
yum makecache
yum install perl-CPAN
yum install rpm
yum install gcc make
cpan App::cpanminus

# Check if is installed module Compress::Zlib :
cpan -l | grep -i Compress::Zlib
  Loading internal null logger. Install Log::Log4perl for logging messages
  Compress::Zlib    2.081
  IO::Compress::Zlib::Constants    2.081
  IO::Compress::Zlib::Extra    2.081

# Check if module PDF::API2: is available
cpan -l | grep -i PDF::API2
  Loading internal null logger. Install Log::Log4perl for logging messages
  PDF::API2    2.043

# Installing it
cpan PDF::API2
  Loading internal null logger. Install Log::Log4perl for logging messages
  Reading '/root/.cpan/Metadata'
  Database was generated on Thu, 16 Dec 2021 13:17:02 GMT
  CPAN: Module::CoreList loaded ok (v5.20181130)
  PDF::API2 is up to date (2.043).