> Probably don't want to have libtest.dll as part of the binary gem unless you want to build fat-binary support for both libtest and ffi_c.so

Oops.  Just looked at spec/ffi/spec_helper.rb and the libtest subdir
from your repo.  Looks like libtest has no deps on Ruby, so scratch my
fat-binry comment for libtest :)

So would the key issue with bundling libtest.dll in a binary gem be
ensuring it was compiled against the same MSVCRT version as Ruby and/
or ffi_c.so?

Jon