updated

INSTALL

@@ -153,45 +153,29 @@ Shadow passwords (also included with most C2 security packages)
 are supported on most major platforms for which they exist.
 The `configure' script will attempt to determine if your
 system uses shadow passwords, but this is really just a guess.
-Also, if you are using an alternate authentication scheme
-(s/key. kerberos, AFS, DCE, etc...) configure will *not* try
-to check for a shadowed passwd file.
-Therefore, it is suggested that you use the `--with-C2' option
-to `configure' if you need shadow password support.
+If configure guesses incorrectly you can use the `--with-C2' option
+to cause sudo to use shadow passwords (assuming sudo can figure
+out what type of shadow password scheme is available).  If configure
+thinks you can shadow passwords but you really do not you can
+use the `--without-C2' option to override configure's guess.
 
 Shadow passwords are supported on the following platforms:
 
     SunOS 4.x
     Solaris 2.x
-    HP-UX 9.x
+    HP-UX 9.x and 10.x
     Ultrix 4.x
-    Digital UNIX 3.x
-    Irix 5.x
-    AIX 3.2.x
+    Digital UNIX 3.x amd 4.x
+    Irix 5.x and 6.x
+    AIX 3.2.x ad 4.x
     ConvexOS with C2 security (not tested recently)
     Linux
     SCO 3.2.2
-    SVR4 (and variants using standard SVR4 shadow passwords)
-
-The following operating systems have shadow passwords turned
-on by *default* (use --without-C2 to turn them off):
-
-    Solaris 2.x
     Pyramid DC/OSx
     UnixWare
-
-The following operating systems have transparent shadow password
-support so --with-C2 and --without-C2 will have no effect
-(and neither is necesary).
-
-    AIX 3.x
-    AIX 4.x
-    BSD/386 1.x
-    BSD/OS 2.x
-    NetBSD
-    FreeBSD
-    OpenBSD
-    HPBSD 2.x
+    SVR4 (and variants using standard SVR4 shadow passwords)
+    4.4BSD based systems (including OpenBSD, NetBSD, FreeBSD)
+    OS's using SecureWare's C2 security.
 
 It is possible to configure in shadow password support even
 if your system does not currently use shadow passwords.
@@ -248,6 +232,17 @@ Ultrix 4.x:
     I recommend it highly.  If you do not do this you probably want
     to set `LOGGING' to SLOG_FILE in options.h.
 
+Digital UNIX:
+    Digital UNIX 4.0 shipped with /usr/include/prot.h including acl.h,
+    but there is no /usr/include/acl.h.  Digital says this will be
+    fixed in the next release of Digital UNIX.  In the meantime
+    you can use the acl.h from /usr/sys/include/sys.  Digital
+    recommends that you just:
+	cd /usr/include
+	ln -s sys/acl.h acl.h
+    This will only be an issue if you are using C2 (enhanced)
+    security.
+
 Linux:
     One person reported that he needed to run configure with
     the --with-getpass flag to get a working sudo.  Other people