* configure.ac (opsysfile): Tweak message for null case.
- * configure.ac (opsysfile): Set to empty on freebsd, gnu-linux,
- gnu-kfreebsd; and to usg5-4-common.h on sol2*, unixware.
+ * configure.ac (opsysfile): Set to empty on aix4-2, freebsd,
+ gnu-linux, gnu-kfreebsd; and to usg5-4-common.h on sol2*, unixware.
2012-07-30 Paul Eggert <eggert@cs.ucla.edu>