Swig is not found under Win32 platform although the %PATH% contains the
correct directory to swig binaries.
The problem is with the Makefile.PL
my $swig_bin = find_bin( 'swig' );
it should be:
my $SWIGFilename = 'swig';
$SWIGFilename .= ".exe" if $^O eq 'MSWin32';
my $swig_bin = find_bin( $SWIGFilename );