Autotools will go to great lengths to check if I'm running BSD 4.2, or a specific version of Xenix from 1987, but just you try running it if your "ls" doesn't h

Autotools will go to great lengths to check if I'm running BSD 4.2, or a specific version of Xenix from 1987, but just you try running it if your "ls" doesn't have a -i flag! Apparently, a filesystem not based around inodes is just inconceivable.