+if ENABLE_GSM_BS
+
+GSM_INCLUDE += -DWITH_GSM_BS
+
+GSM_SOURCE += gsm_bs.cpp
+
+endif
+
+if ENABLE_GSM_MS
+
+GSM_INCLUDE += -DWITH_GSM_MS
+
+GSM_SOURCE += gsm_ms.cpp
+
+endif
+
+if ENABLE_SS5
+
+SS5_INCLUDE = -DWITH_SS5
+
+SS5_SOURCE = ss5.cpp ss5_encode.c ss5_decode.c
+
+endif
+