##
opendir my $dh, $header_dir or die "Failed to opendir '$header_dir' to find header files: $!";
####
C:\>perl -le "opendir my $dh, 'C:\strawberry\perl\lib\CORE' or die $!;"
C:\>perl -le "opendir my $dh, 'C:\strawb~1\perl\lib\CORE' or die $!;"
C:\>perl -le "opendir my $dh, 'C:\STRAWB~1\perl\lib\CORE' or die $!;"
C:\>