Indeed, my version of make doesn't have the --jobserver-style option. If I remove the reference to --jobserver-style option from ./make the package builds without any obvious errors but doesn't appear to be a complete build.
Yeah, for some reason parallel builds weren't fully working before this option (I knew more when I debugged this but I've since forgotten). I don't think I realized the option was so recent. As Alexis says, your best choice is to use GNU Make 4.4, but if you cannot, the workaround is not to use any -j option to make, which should eventually, very slowly, get you a complete build. -- Laurent