Fix the include_next test so that it rejects AIX 4.3 xlc.

[pspp] / ChangeLog

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+2007-07-25  Peter O'Gorman  <peter@pogma.com>
+            Bruno Haible  <bruno@clisp.org>
+
+       * m4/include_next.m4 (gl_INCLUDE_NEXT): Test whether #include_next
+       really works. Needed because AIX 4.3 "xlc -E" doesn't understand
+       #include_next, gives a diagnostic about it, but reports no error in
+       the exit code.
+       Reported by Gary V. Vaughan <gary@thewrittenword.com>.
+
 2007-07-24  Ben Pfaff  <blp@gnu.org>
 
        Improve name: "count-one-bits" is better than "popcount".