It's unlikely that you would have the same exact failures as what someone else was experiencing six months ago. Inline and Inline::C have undergone a lot of revisions since then, including splitting them into separate distributions.

Do this: Clone https://github.com/ingydotnet/inline-pm.git and https://github.com/ingydotnet/inline-c-pm.git, each into their own folders, and run make test. This will spit out a more verbose log of test passes/fails. Try this for each of Inline and Inline::C. That should give you a better idea of what is wrong. Feel free to drop by irc.perl.org#inline to discuss issues, or open a GitHub issue.