-dnl Look for the initgroups() declaration. On AIX 4.[13] and Solaris 4.1.3,
-dnl the function is defined in libc but there's no declaration in any system
-dnl header.
+dnl Look for the initgroups() declaration. On AIX 4.[13], Solaris 4.1.3, and
+dnl ULTRIX 4.2A the function is defined in libc but there's no declaration in
+dnl any system header.