Yes, I got something new now, that said

 'format \'gif\' not supported - formats bmp, ico, pnm, raw, sgi, tga 
+available for writing - Can\'t locate Imager/File/GIF.pm'
[download]

and this bug was actually reported at https://rt.cpan.org/Public/Bug/Display.html?id=90785

So I tried to find Imager::File::GIF, nothing from ppm, but cpan. However, when I use cpan, it's ok to download the package file, but fails during install:

C:\Documents and Settings\Panda>cpan Imager::File::GIF
Set up gcc environment - 3.4.5 (mingw-vista special r3)
CPAN: Term::ANSIColor loaded ok (v3.00)
CPAN: Storable loaded ok (v2.27)
Reading 'R:\Programming\Perl\cpan\Metadata'
  Database was generated on Sun, 03 Aug 2014 12:06:12 GMT
Running install for module 'Imager::File::GIF'
CPAN: Digest::SHA loaded ok (v5.61)
CPAN: Compress::Zlib loaded ok (v2.033)
Checksum for R:\Programming\Perl\cpan\sources\authors\id\T\TO\TONYC\Im
+ager-File-GIF-0.89.tar.gz ok
CPAN: Archive::Tar loaded ok (v1.76)

Imager-File-GIF-0.89/
Imager-File-GIF-0.89/imgif.h
Imager-File-GIF-0.89/META.yml
Imager-File-GIF-0.89/README
Imager-File-GIF-0.89/MANIFEST
Imager-File-GIF-0.89/imgif.c
Imager-File-GIF-0.89/t/
Imager-File-GIF-0.89/t/t30fixed.t
Imager-File-GIF-0.89/t/t10gif.t
Imager-File-GIF-0.89/t/t20new.t
Imager-File-GIF-0.89/t/t40limit.t
Imager-File-GIF-0.89/t/t50header.t
Imager-File-GIF-0.89/Changes
Imager-File-GIF-0.89/Makefile.PL
Imager-File-GIF-0.89/GIF.xs
Imager-File-GIF-0.89/MANIFEST.SKIP
Imager-File-GIF-0.89/GIF.pm
Imager-File-GIF-0.89/testimg/
Imager-File-GIF-0.89/testimg/scalei.gif
Imager-File-GIF-0.89/testimg/scale.gif
Imager-File-GIF-0.89/testimg/screen3.gif
Imager-File-GIF-0.89/testimg/bandw.gif
Imager-File-GIF-0.89/testimg/trmiddesc.gif
Imager-File-GIF-0.89/testimg/trimgdesc.gif
Imager-File-GIF-0.89/testimg/loccmap.gif
Imager-File-GIF-0.89/testimg/expected.gif
Imager-File-GIF-0.89/testimg/zerocomm.gif
Imager-File-GIF-0.89/testimg/screen2.gif
Imager-File-GIF-0.89/testimg/nocmap.gif
Imager-File-GIF-0.89/testimg/badindex.gif
Imager-File-GIF-0.89/META.json
Imager-File-GIF-0.89/inc/
Imager-File-GIF-0.89/inc/Devel/
Imager-File-GIF-0.89/inc/Devel/CheckLib.pm
CPAN: File::Temp loaded ok (v0.22)
CPAN: YAML::XS loaded ok (v0.35)
CPAN: Parse::CPAN::Meta loaded ok (v1.4401)
CPAN: CPAN::Meta loaded ok (v2.110930)
CPAN: Module::CoreList loaded ok (v2.49)
Configuring T/TO/TONYC/Imager-File-GIF-0.89.tar.gz with Makefile.PL
Set up gcc environment - 3.4.5 (mingw-vista special r3)
GIF: building independently
GIF: main: includes not found - libraries not found
GIF: Checking if the compiler can find them on its own
Note (probably harmless): No library found for -lgif
GIF: Test code failed: Can't link/include 'gif_lib.h', 'stdio.h', 'err
+no.h', 'string.h', 'gif'
OS unsupported: GIF libraries or headers not found
Warning: No success on command[R:\Programming\Perl\bin\perl.exe Makefi
+le.PL INSTALLDIRS=site]
  TONYC/Imager-File-GIF-0.89.tar.gz
  R:\Programming\Perl\bin\perl.exe Makefile.PL INSTALLDIRS=site -- NOT
+ OK
[download]

I don't know much about C though... but I guess what I am going to do is try to find those .h files, but where should I put them so I can make the compile success ? or do I need to also find the C source ? Any further workaround you might suggest ?

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