+if ENABLE_GSM
+
+GSM_INCLUDE +=
+
+GSM_SOURCE += gsm_audio.c gsm.cpp
+
+GSM_LIB += /usr/lib/libgsm.a
+
+#gsm_audio.po: gsm_audio.c gsm_audio.h
+# $(CC) -D_GNU_SOURCE -fPIC -c gsm_audio.c -o gsm_audio.po
+
+endif
+
+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