I tried to run the test but it ended with the error.

c:\sam>cpanp -t Win32::GUI
Set up gcc environment - 3.4.5 (mingw-vista special r3)
Testing Win32::GUI (1.06)
Running [C:\Perl\bin\perl.exe -e use strict; BEGIN { my $old = select 
+STDERR; $|
++; select $old; $|++; $0 = shift(@ARGV); my $rv = do($0); die $@ if $
+@; } C:\Us
ers\BLACKDOG\.cpanplus\5.16.3\build\Win32-GUI-1.06\Makefile.PL]...
Set up gcc environment - 3.4.5 (mingw-vista special r3)

Building on OS MSWin32 with compiler C:\Perl\site\bin\gcc.exe is not o
+fficially
supported.
To force a build call this script with the additional parameter 'BUILD
+ENV':

  perl Makefile.PL BUILDENV=xxxx

where xxxx is one of:
Build Environment unsupported
BEGIN failed--compilation aborted at -e line 1.
vc      (MSWin32 and Visual C++)
mingw   (MSWin32 and MinGW)
cygwin  (Cygwin)
[ERROR] Could not run 'C:\Perl\bin\perl.exe Makefile.PL': Set up gcc e
+nvironment
 - 3.4.5 (mingw-vista special r3)

Building on OS MSWin32 with compiler C:\Perl\site\bin\gcc.exe is not o
+fficially
supported.
To force a build call this script with the additional parameter 'BUILD
+ENV':

  perl Makefile.PL BUILDENV=xxxx

where xxxx is one of:
Build Environment unsupported
BEGIN failed--compilation aborted at -e line 1.
vc      (MSWin32 and Visual C++)
mingw   (MSWin32 and MinGW)
cygwin  (Cygwin)
 -- cannot continue

[ERROR] Unable to create a new distribution object for 'Win32::GUI' --
+ cannot co
ntinue

*** Install log written to:
  C:\Users\BLACKDOG\.cpanplus\install-logs\Win32-GUI-1.06-1367848691.l
+og
[download]