diff --git a/refimpl/Makefile b/refimpl/Makefile
new file mode 100644
index 0000000..0deed19
--- /dev/null
+++ b/refimpl/Makefile
@@ -0,0 +1,18 @@
+#
+# Makefile for software reference implementations of PRNGs.
+#
+# This makefile works with GCC under Linux.
+#
+
+all: ref_xoroshiro ref_mt19937
+
+ref_xoroshiro: ref_xoroshiro.c
+	$(CC) -std=c11 -Wall -O2 -o $@ $<
+
+ref_mt19937: ref_mt19937.cpp
+	$(CXX) -std=c++11 -Wall -O2 -o $@ $<
+
+.PHONY: clean
+clean:
+	$(RM) ref_xoroshiro ref_mt19937
+