diff --git a/slowcat/GNUmakefile b/slowcat/GNUmakefile
index 0232bd4..f6ae7ff 100644
--- a/slowcat/GNUmakefile
+++ b/slowcat/GNUmakefile
@@ -8,6 +8,11 @@ clean:
 	rm -f *.bak *.o core slowcat
 
 distclean: clean
-	rm -f *.d
+	rm -f *.d GNUmakerules GNUmakevars
+
+GNUmakevars: GNUmakevars.sh
+	sh ./$^ > $@
+GNUmakerules: GNUmakerules.pl
+	perl ./$^ > $@
 
 -include *.d
diff --git a/slowcat/GNUmakerules.pl b/slowcat/GNUmakerules.pl
new file mode 100644
index 0000000..8f30daa
--- /dev/null
+++ b/slowcat/GNUmakerules.pl
@@ -0,0 +1,8 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+
+print "\$(BINDIR)/%: %\n";
+print "\tcp \$^ \$@\n";
+print "\$(MAN1DIR)/%: %\n";
+print "\tcp \$^ \$@\n";
diff --git a/slowcat/GNUmakevars.sh b/slowcat/GNUmakevars.sh
new file mode 100755
index 0000000..a7de4ae
--- /dev/null
+++ b/slowcat/GNUmakevars.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+prefix=${prefix:-/usr/local}
+echo "BINDIR=$prefix/bin"
+echo
+echo "all:"