diff --git a/chartab/GNUmakefile b/chartab/GNUmakefile
index 7dfdcbe..54732fa 100644
--- a/chartab/GNUmakefile
+++ b/chartab/GNUmakefile
@@ -1,11 +1,19 @@
-include GNUmakevars
+-include GNUmakevars
 
 all: chartab ctype-test
 
-chartab:
+chartab: chartab.pl
+	cp $^ $@
+
 ctype-test:
 clean:
 	rm chartab
 install: $(BINDIR)/chartab $(BINDIR)/ctype-test
 
-include GNUmakerules
+GNUmakevars: GNUmakevars.sh
+	sh ./$^ > $@
+GNUmakerules: GNUmakerules.pl
+	perl ./$^ > $@
+
+
+-include GNUmakerules
diff --git a/chartab/GNUmakerules.pl b/chartab/GNUmakerules.pl
new file mode 100644
index 0000000..15db030
--- /dev/null
+++ b/chartab/GNUmakerules.pl
@@ -0,0 +1,8 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+
+print "\$(BINDIR)/%: %\n";
+print "\tinstall -m 755 \$^ \$@\n";
+print "\$(MAN1DIR)/%: %\n";
+print "\tinstall -m 644 \$^ \$@\n";
diff --git a/chartab/GNUmakevars.sh b/chartab/GNUmakevars.sh
new file mode 100644
index 0000000..a7de4ae
--- /dev/null
+++ b/chartab/GNUmakevars.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+prefix=${prefix:-/usr/local}
+echo "BINDIR=$prefix/bin"
+echo
+echo "all:"