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+2013-04-26  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Port better to AIX (Bug#14258).
+        * configure.ac (CFLAGS): Append -O if the user did not specify CFLAGS,
+        we did not already infer an optimization option, and -O works.
+        AIX xlc needs -O, otherwise garbage collection doesn't work.
+
 2013-04-22  Paul Eggert  <eggert@cs.ucla.edu>
 
         * make-dist: Do not distribute admin/unidata/Makefile.