Tobias Geerinckx-Rice writes: >> My diff from linux-libre, which sure seems to tell a story: >> >> y -> not set CONFIG_UID16 (obsolete) > > As expected upthread, this and this alone was indeed the culprit. I > don't see any evidence of interaction with other options though. > I tried working around the issue by patching stuff (either the shell, or using the "test" utility), but I gave up after too many things to patch. I guess the most appropriate would be to wait for the full x86_64 support from GNU mes, and if it persists, to open bugs to binutils, gash, or whatever else uses the inbuilt "test" functionality of the shell.