diff --git a/dns/GNUmakefile b/dns/GNUmakefile
index d9ffb12..8997acc 100644
--- a/dns/GNUmakefile
+++ b/dns/GNUmakefile
@@ -1,5 +1,4 @@
 include GNUmakevars
-include GNUmakerules
 
 all: gethostbyname fqdn
 install: \
@@ -29,4 +28,11 @@ axfr:
 	cp $< $@
 	chmod +x $@
 
+GNUmakevars: GNUmakevars.sh
+	sh ./$^ > $@
+GNUmakerules: GNUmakerules.sh
+	sh ./$^ > $@
+
+include GNUmakerules
+
 -include *.d
diff --git a/dns/GNUmakerules.sh b/dns/GNUmakerules.sh
new file mode 100755
index 0000000..e523b37
--- /dev/null
+++ b/dns/GNUmakerules.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+echo "\$(BINDIR)/%: %"
+echo -e "\tcp \$^ \$@"
diff --git a/dns/GNUmakevars.sh b/dns/GNUmakevars.sh
new file mode 100755
index 0000000..a7de4ae
--- /dev/null
+++ b/dns/GNUmakevars.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+prefix=${prefix:-/usr/local}
+echo "BINDIR=$prefix/bin"
+echo
+echo "all:"