diff --git a/CommonLibs/Makefile.am b/CommonLibs/Makefile.am
index 5d116f9..613af1e 100644
--- a/CommonLibs/Makefile.am
+++ b/CommonLibs/Makefile.am
@@ -52,4 +52,5 @@
 	Vector.h \
 	Logger.h \
 	trx_vty.h \
-	debug.h
+	debug.h \
+	config_defs.h
diff --git a/CommonLibs/config_defs.h b/CommonLibs/config_defs.h
new file mode 100644
index 0000000..8626166
--- /dev/null
+++ b/CommonLibs/config_defs.h
@@ -0,0 +1,20 @@
+#pragma once
+
+/*
+ * This file contains structures used by both VTY (C, dir CommonLibs) and
+ * osmo-trx (CXX, dir Transceiver52)
+ */
+
+enum FillerType {
+  FILLER_DUMMY,
+  FILLER_ZERO,
+  FILLER_NORM_RAND,
+  FILLER_EDGE_RAND,
+  FILLER_ACCESS_RAND,
+};
+
+enum ReferenceType {
+  REF_INTERNAL,
+  REF_EXTERNAL,
+  REF_GPS,
+};