diff --git a/sim/Makefile b/sim/Makefile
new file mode 100644
index 0000000..2077858
--- /dev/null
+++ b/sim/Makefile
@@ -0,0 +1,23 @@
+
+GHDL = ghdl
+GHDLFLAGS =
+
+.PHONY: all
+all: sim_sincos_d18_p20_probe
+
+sim_sincos_d18_p20_probe: sim_sincos_d18_p20_probe.o sincos_gen_d18_p20.o sincos_gen.o
+	$(GHDL) $(GHDLFLAGS) -e $@
+
+sincos_gen.o: ../rtl/sincos_gen.vhdl
+	$(GHDL) $(GHDLFLAGS) -a $<
+
+sincos_gen_d18_p20.o: ../rtl/sincos_gen_d18_p20.vhdl sincos_gen.o
+	$(GHDL) $(GHDLFLAGS) -a $<
+
+sim_sincos_d18_p20_probe.o: sim_sincos_d18_p20_probe.vhdl sincos_gen_d18_p20.o
+	$(GHDL) $(GHDLFLAGS) -a $<
+
+.PHONY: clean
+clean:
+	$(GHDL) --remove
+