diff --git a/ieeefloat/GNUmakefile b/ieeefloat/GNUmakefile
index bd96d54..ecc05db 100644
--- a/ieeefloat/GNUmakefile
+++ b/ieeefloat/GNUmakefile
@@ -7,7 +7,7 @@ clean:
 	rm -f *.bak *.o core ieeefloat
 
 distclean: clean
-	rm -f *.d
+	rm -f *.d GNUmakerules GNUmakevars
 
 ieeefloat: ieeefloat.o
 
diff --git a/ieeefloat/GNUmakerules.sh b/ieeefloat/GNUmakerules.sh
new file mode 100755
index 0000000..952629f
--- /dev/null
+++ b/ieeefloat/GNUmakerules.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+echo "\$(BINDIR)/%: %"
+echo -e "\tcp \$^ \$@"
+echo "\$(MAN1DIR)/%: %"
+echo -e "\tcp \$^ \$@"
diff --git a/ieeefloat/GNUmakevars.sh b/ieeefloat/GNUmakevars.sh
new file mode 100755
index 0000000..1443f83
--- /dev/null
+++ b/ieeefloat/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:"