> And you are sure '"x=" = x' evaluates correctly on these systems? > I am having strong doubts.
I just checked the Unix Version 7 source (dated 1979-01-10), and it handles it correctly. It also has the incompatibilities described in the Autoconf manual. The incompatible versions are descended from the V7 source, so I expect that "test x= = x" is safe everywhere that we care about.
