diff --git a/configure b/configure
index 791f65fa4..faaad179f 100755
--- a/configure
+++ b/configure
@@ -24522,6 +24522,27 @@ $as_echo "$as_me: You will need to customize sample.pam and install it as /etc/p
 	    ;;
     esac
 fi
+clear_rundir=0
+case $host_os in
+    hpux*|aix*)
+	clear_rundir=1
+	;;
+    *)
+	case "$rundir" in
+	    /var/run*)
+		;;
+	    *)
+		clear_rundir=1
+		;;
+	esac
+	;;
+esac
+if test $clear_rundir -eq 1; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: Warning: the $rundir/ts directory must be cleared at boot time." >&5
+$as_echo "$as_me: Warning: the $rundir/ts directory must be cleared at boot time." >&6;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}:          You may need to create a startup item to do this." >&5
+$as_echo "$as_me:          You may need to create a startup item to do this." >&6;}
+fi
 
 
 
diff --git a/configure.ac b/configure.ac
index 2ac883db1..72b941a71 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3809,6 +3809,29 @@ if test "$with_pam" = "yes"; then
 	    ;;
     esac
 fi
+dnl
+dnl AIX and HP-UX do not clear /var/run
+dnl Also point out other non-cleared dirs
+dnl
+clear_rundir=0
+case $host_os in
+    hpux*|aix*)
+	clear_rundir=1
+	;;
+    *)
+	case "$rundir" in
+	    /var/run*)
+		;;
+	    *)
+		clear_rundir=1
+		;;
+	esac
+	;;
+esac
+if test $clear_rundir -eq 1; then
+    AC_MSG_NOTICE([Warning: the $rundir/ts directory must be cleared at boot time.])
+    AC_MSG_NOTICE([         You may need to create a startup item to do this.])
+fi
 
 dnl
 dnl Autoheader templates