...
Checking for module Imager:                       OK
Checking for module Imager::File::PNG:
Not installed, do you want to install it now? {y|n} [y]
Attempting to install Imager::File::PNG...
Going to read '/root/.cpan/Metadata'
  Database was generated on Thu, 21 Aug 2014 16:29:02 GMT
Running install for module 'Imager::File::PNG'
Running make for T/TO/TONYC/Imager-File-PNG-0.91.tar.gz
Checksum for /root/.cpan/sources/authors/id/T/TO/TONYC/Imager-File-PNG-0.91.tar.gz ok

  CPAN.pm: Going to build T/TO/TONYC/Imager-File-PNG-0.91.tar.gz

PNG: building independently
PNG: Generic: includes not found - libraries not found
PNG: v1.6: includes not found - libraries not found
PNG: v1.5: includes not found - libraries not found
PNG: v1.4: includes not found - libraries not found
PNG: v1.2: includes not found - libraries not found
PNG: v1.0: includes not found - libraries not found
PNG: base (+libz): includes not found - libraries not found
PNG: v1.6 (+libz): includes not found - libraries not found
PNG: v1.5 (+libz): includes not found - libraries not found
PNG: v1.4 (+libz): includes not found - libraries not found
PNG: v1.2 (+libz): includes not found - libraries not found
PNG: v1.0 (+libz): includes not found - libraries not found
PNG: Checking if the compiler can find them on its own
Warning (mostly harmless): No library found for -lpng
PNG: Test code failed: Can't link/include 'png.h', 'stdio.h', 'png'
OS unsupported: PNG libraries or headers not found
Warning: No success on command[/usr/bin/perl Makefile.PL INSTALLDIRS=site]
'YAML' not installed, will not store persistent state
  TONYC/Imager-File-PNG-0.91.tar.gz
  /usr/bin/perl Makefile.PL INSTALLDIRS=site -- NOT OK
Running make test
  Make had some problems, won't test
Running make install
  Make had some problems, won't install
Could not read metadata file. Falling back to other methods to determine prerequisites
Checking for module Imager::File::PNG:            Install of Imager::File::PNG failed!