title: CPAN install module meet make file not ok issue
body: <p>I'm trying to run this script on my computer (MAC) </p>
  
  <p><a href="http://mkweb.bcgsc.ca/color-summarizer/?download" rel="nofollow noreferrer">http://mkweb.bcgsc.ca/color-summarizer/?download</a></p>
  
  <p>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 :</p>
  
  <pre><code> 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.
  </code></pre>
  
  <p>And so I use :</p>
  
  <pre><code> sudo cpan install Imager::File::GIF 
  </code></pre>
  
  <p>for example. But the I get this : </p>
  
  <pre><code> 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
  </code></pre>
  
  <p>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</p>