diff --git a/src/GF/Source/Makefile b/src/GF/Source/Makefile
new file mode 100644
index 000000000..50463c796
--- /dev/null
+++ b/src/GF/Source/Makefile
@@ -0,0 +1,6 @@
+all:
+	cd ../.. && bnfc -p GF.Source -bytestrings -sharestrings GF/Source/GF.cf
+	rm ErrM.hs
+	perl -i -pe 's/GF.Source.ErrM/GF.Data.ErrM/' *.hs *.x *.y
+	happy -gca ParGF.y
+	alex -g LexGF.x