diff --git a/Z4cow/src/make.code.defn b/Z4cow/src/make.code.defn
new file mode 100644
index 00000000..da24e9d2
--- /dev/null
+++ b/Z4cow/src/make.code.defn
@@ -0,0 +1,14 @@
+# Main make.code.defn file for thorn Z4c
+
+# Source files in this directory
+SRCS = \
+  adm.cxx \
+	constraint.cxx \
+	enforce.cxx	\
+	initial1.cxx \
+	initial2.cxx \
+	newradx.cxx \
+	rhs.cxx
+
+# Subdirectories containing source files
+SUBDIRS =