If you have a look at the FAIL report you will see:
cygwin-thread-multi-64int
which might explain a few things..
Update:
if the scalar is 4 bytes longAlso in the FAIL report is:
ivsize=8Update2: I tried to install your module on 64-bit Windows. First it failed because you are using Build, and that failed calling Probe::Perl, which is not in the dependency list. Using cpanp hung, so I tried cpan and install, that failed because Build tried to call 'make', and it should be 'nmake'. So I tried again manually now that Build had been installed. The README file said to type "Build make" but that said "No action 'make' defined". So I tried "Build test" and that failed trying to load bufferoverflowU.lib - which is a well-known issue on Windows. Normally I would edit the Makefile, but Build is not creating one. At that point I gave up.