diff --git a/agestat/GNUmakefile b/agestat/GNUmakefile
index 7012132..5846100 100644
--- a/agestat/GNUmakefile
+++ b/agestat/GNUmakefile
@@ -23,4 +23,10 @@ customize: configure
 $(BINDIR):
 	mkdir -p $@
 
+GNUmakevars: GNUmakevars.sh
+	sh ./$^ > $@
+GNUmakerules: GNUmakerules.sh
+	sh ./$^ > $@
+
+
 include GNUmakerules
diff --git a/agestat/GNUmakerules.sh b/agestat/GNUmakerules.sh
new file mode 100755
index 0000000..952629f
--- /dev/null
+++ b/agestat/GNUmakerules.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+echo "\$(BINDIR)/%: %"
+echo -e "\tcp \$^ \$@"
+echo "\$(MAN1DIR)/%: %"
+echo -e "\tcp \$^ \$@"
diff --git a/agestat/GNUmakevars.sh b/agestat/GNUmakevars.sh
new file mode 100755
index 0000000..1443f83
--- /dev/null
+++ b/agestat/GNUmakevars.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+prefix=${prefix:-/usr/local}
+echo "BINDIR=$prefix/bin"
+
+for i in "$prefix/share/man/man1" "$prefix/man/man1"
+do
+	if [ -d "$i" -a -w "$i" ]
+	then
+		echo "MAN1DIR=$i"
+		break;
+	fi
+done
+
+echo
+echo "all:"
diff --git a/agestat/agestat.pl b/agestat/agestat.pl
index 8e70b2b..f240fb8 100755
--- a/agestat/agestat.pl
+++ b/agestat/agestat.pl
@@ -1,6 +1,6 @@
 #!@@@perl@@@ -w
 #
-# $Id: agestat.pl,v 1.7 2006-02-17 13:50:23 hjp Exp $
+# $Id: agestat.pl,v 1.8 2007-02-09 15:36:37 hjp Exp $
 #
 
 use strict;
@@ -8,11 +8,16 @@ use File::stat;
 use File::Find;
 use Getopt::Long;
 
+sub usage {
+    print STDERR "Usage: $0 [-atime|-mtime] [-scale=(k|M)]\n";
+    exit 1;
+}
+
 my $now = time();
 my @bucket_max;
 
 my %opts = (buckets => 'log2');
-GetOptions(\%opts, "atime", "mtime", "scale=s", "buckets=s");
+GetOptions(\%opts, "atime", "mtime", "scale=s", "buckets=s") or usage();
 my $scale;
 if (!defined($opts{scale})) {
     $scale = 1;
@@ -21,8 +26,7 @@ if (!defined($opts{scale})) {
 } elsif ($opts{scale} eq 'M') {
     $scale = 1024*1024;
 } else {
-    print STDERR "Usage: $0 [-atime|-mtime] [-scale=(k|M)]\n";
-    exit 1;
+    usage();
 }
 
 if ($opts{buckets} eq "log2") {
@@ -102,7 +106,11 @@ for (my $i = 0; $i <= $#hist; $i++) {
 }
 
 # $Log: agestat.pl,v $
-# Revision 1.7  2006-02-17 13:50:23  hjp
+# Revision 1.8  2007-02-09 15:36:37  hjp
+# Automatically create GNUmakerules and GNUmakevars if they don't exist.
+# Print usage if unknown option is given.
+#
+# Revision 1.7  2006/02/17 13:50:23  hjp
 # Fixed error when oldest file was older than oldest bucket.
 # Realigned columns.
 #