CPAN install module meet make file not ok issue - perl

Question

I'm trying to run this script on my computer (MAC)
http://mkweb.bcgsc.ca/color-summarizer/?download
It's the first time in my life touching the terminal... so you understand that I ask very basic questions. please do forgive me...
basically when i execute the script, I would always get this kind of message :
Can't locate Imager/File/GIF.pm in #INC (you may need to install the
Imager::File::GIF module) (#INC contains:
/Applications/colorsummarizer/colorsummarizer-0.77/bin/lib
/Applications/colorsummarizer/colorsummarizer-0.77/bin/../lib
/Applications/colorsummarizer/colorsummarizer-0.77/bin
/Library/Perl/5.18/darwin-thread-multi-2level /Library/Perl/5.18
/Network/Library/Perl/5.18/darwin-thread-multi-2level
/Network/Library/Perl/5.18 /Library/Perl/Updates/5.18.2/darwin-thread-
multi-2level /Library/Perl/Updates/5.18.2
/System/Library/Perl/5.18/darwin-thread-multi-2level
/System/Library/Perl/5.18 /System/Library/Perl/Extras/5.18/darwin-
thread-multi-2level /System/Library/Perl/Extras/5.18) at
/Library/Perl/5.18/darwin-thread-multi-2level/Imager.pm line 1677.
And so I use :
sudo cpan install Imager::File::GIF
for example. But the I get this :
Warning (mostly harmless): No library found for -lgif
GIF: Test code failed: Can't link/include 'gif_lib.h', 'stdio.h',
'errno.h', 'string.h', 'gif'
OS unsupported: GIF libraries or headers not found
Warning: No success on command[/usr/bin/perl Makefile.PL]
TONYC/Imager-File-GIF-0.91.tar.gz
/usr/bin/perl Makefile.PL -- 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
And ! it seems like even when I appear to install something successfully, The system ask me to re-install them again and again and again...
Maybe I did some very fundamental mistakes ?
Thanks a lot for your attention

Answer 1

The issue identified by the following message is not harmless at all, actually:
Warning (mostly harmless): No library found for -lgif
GIF: Test code failed: Can't link/include 'gif_lib.h', 'stdio.h',
'errno.h', 'string.h', 'gif'
The module uses libgif to do all the heavy work, but it's not installed. Furthermore, the installation procedure needs the library's header files.
Imager::File::GIF provides GIF file format support for Imager.
It requires libgif to be installed, including development headers.
For Linux distributions this typically requires installation of the
associated -dev or -devel package.
Installing the required library and header files might be as simple as asking your OS's package manager to install libgif-dev or libgif-devel.

Answer 2

Try to just install Imager like this, it might be all you need:
sudo cpan Imager
After that it could open gifs for me.