diff --git a/include/osmo-bts/gsm_data_shared.h b/include/osmo-bts/gsm_data_shared.h
index 41998ad80..3943e5002 100644
--- a/include/osmo-bts/gsm_data_shared.h
+++ b/include/osmo-bts/gsm_data_shared.h
@@ -342,13 +342,13 @@ static inline const char *lchan_ciph_state_name(uint8_t state) {
 	return get_value_string(lchan_ciph_state_names, state);
 }
 
-enum {
+enum gsm_bts_trx_ts_flags {
 	TS_F_PDCH_ACTIVE =		0x1000,
 	TS_F_PDCH_ACT_PENDING =		0x2000,
 	TS_F_PDCH_DEACT_PENDING =	0x4000,
 	TS_F_PDCH_PENDING_MASK =	0x6000 /*<
 			TS_F_PDCH_ACT_PENDING | TS_F_PDCH_DEACT_PENDING */
-} gsm_bts_trx_ts_flags;
+};
 
 /* One Timeslot in a TRX */
 struct gsm_bts_trx_ts {
@@ -793,8 +793,8 @@ enum gsm_bts_type_variant str2btsvariant(const char *arg);
 const char *btsvariant2str(enum gsm_bts_type_variant v);
 
 extern const struct value_string gsm_chreq_descs[];
-const struct value_string gsm_pchant_names[13];
-const struct value_string gsm_pchant_descs[13];
+extern const struct value_string gsm_pchant_names[13];
+extern const struct value_string gsm_pchant_descs[13];
 const char *gsm_pchan_name(enum gsm_phys_chan_config c);
 enum gsm_phys_chan_config gsm_pchan_parse(const char *name);
 const char *gsm_lchant_name(enum gsm_chan_t c);
diff --git a/include/osmo-bts/scheduler_backend.h b/include/osmo-bts/scheduler_backend.h
index 51c957cc3..c52bc70be 100644
--- a/include/osmo-bts/scheduler_backend.h
+++ b/include/osmo-bts/scheduler_backend.h
@@ -40,8 +40,8 @@ extern const struct trx_chan_desc trx_chan_desc[_TRX_CHAN_MAX];
 
 extern const ubit_t _sched_tsc[8][26];
 extern const ubit_t _sched_egprs_tsc[8][78];
-const ubit_t _sched_fcch_burst[148];
-const ubit_t _sched_sch_train[64];
+extern const ubit_t _sched_fcch_burst[148];
+extern const ubit_t _sched_sch_train[64];
 
 struct msgb *_sched_dequeue_prim(struct l1sched_trx *l1t, int8_t tn, uint32_t fn,
 				 enum trx_chan_type chan);
diff --git a/src/osmo-bts-litecell15/lc15bts.h b/src/osmo-bts-litecell15/lc15bts.h
index 4c40db0f5..31ca92396 100644
--- a/src/osmo-bts-litecell15/lc15bts.h
+++ b/src/osmo-bts-litecell15/lc15bts.h
@@ -23,24 +23,24 @@ enum l1prim_type {
 };
 
 enum l1prim_type lc15bts_get_l1prim_type(GsmL1_PrimId_t id);
-const struct value_string lc15bts_l1prim_names[GsmL1_PrimId_NUM+1];
+extern const struct value_string lc15bts_l1prim_names[GsmL1_PrimId_NUM+1];
 GsmL1_PrimId_t lc15bts_get_l1prim_conf(GsmL1_PrimId_t id);
 
 enum l1prim_type lc15bts_get_sysprim_type(Litecell15_PrimId_t id);
-const struct value_string lc15bts_sysprim_names[Litecell15_PrimId_NUM+1];
+extern const struct value_string lc15bts_sysprim_names[Litecell15_PrimId_NUM+1];
 Litecell15_PrimId_t lc15bts_get_sysprim_conf(Litecell15_PrimId_t id);
 
-const struct value_string lc15bts_l1sapi_names[GsmL1_Sapi_NUM+1];
-const struct value_string lc15bts_l1status_names[GSML1_STATUS_NUM+1];
+extern const struct value_string lc15bts_l1sapi_names[GsmL1_Sapi_NUM+1];
+extern const struct value_string lc15bts_l1status_names[GSML1_STATUS_NUM+1];
 
-const struct value_string lc15bts_tracef_names[29];
-const struct value_string lc15bts_tracef_docs[29];
+extern const struct value_string lc15bts_tracef_names[29];
+extern const struct value_string lc15bts_tracef_docs[29];
 
-const struct value_string lc15bts_tch_pl_names[15];
+extern const struct value_string lc15bts_tch_pl_names[15];
 
-const struct value_string lc15bts_clksrc_names[10];
+extern const struct value_string lc15bts_clksrc_names[10];
 
-const struct value_string lc15bts_dir_names[6];
+extern const struct value_string lc15bts_dir_names[6];
 
 enum pdch_cs {
 	PDCH_CS_1,
@@ -59,6 +59,6 @@ enum pdch_cs {
 	_NUM_PDCH_CS
 };
 
-const uint8_t pdch_msu_size[_NUM_PDCH_CS];
+extern const uint8_t pdch_msu_size[_NUM_PDCH_CS];
 
 #endif /* LC15BTS_H */
diff --git a/src/osmo-bts-oc2g/oc2gbts.h b/src/osmo-bts-oc2g/oc2gbts.h
index 9eb87452a..80fd1d590 100644
--- a/src/osmo-bts-oc2g/oc2gbts.h
+++ b/src/osmo-bts-oc2g/oc2gbts.h
@@ -39,26 +39,26 @@ enum oc2g_auto_pwr_adjust_mode{
 };
 
 enum l1prim_type oc2gbts_get_l1prim_type(GsmL1_PrimId_t id);
-const struct value_string oc2gbts_l1prim_names[GsmL1_PrimId_NUM+1];
+extern const struct value_string oc2gbts_l1prim_names[GsmL1_PrimId_NUM+1];
 GsmL1_PrimId_t oc2gbts_get_l1prim_conf(GsmL1_PrimId_t id);
 
 enum l1prim_type oc2gbts_get_sysprim_type(Oc2g_PrimId_t id);
-const struct value_string oc2gbts_sysprim_names[Oc2g_PrimId_NUM+1];
+extern const struct value_string oc2gbts_sysprim_names[Oc2g_PrimId_NUM+1];
 Oc2g_PrimId_t oc2gbts_get_sysprim_conf(Oc2g_PrimId_t id);
 
-const struct value_string oc2gbts_l1sapi_names[GsmL1_Sapi_NUM+1];
-const struct value_string oc2gbts_l1status_names[GSML1_STATUS_NUM+1];
+extern const struct value_string oc2gbts_l1sapi_names[GsmL1_Sapi_NUM+1];
+extern const struct value_string oc2gbts_l1status_names[GSML1_STATUS_NUM+1];
 
-const struct value_string oc2gbts_tracef_names[29];
-const struct value_string oc2gbts_tracef_docs[29];
+extern const struct value_string oc2gbts_tracef_names[29];
+extern const struct value_string oc2gbts_tracef_docs[29];
 
-const struct value_string oc2gbts_tch_pl_names[15];
+extern const struct value_string oc2gbts_tch_pl_names[15];
 
-const struct value_string oc2gbts_clksrc_names[10];
+extern const struct value_string oc2gbts_clksrc_names[10];
 
-const struct value_string oc2gbts_dir_names[6];
+extern const struct value_string oc2gbts_dir_names[6];
 
-const struct value_string oc2gbts_rsl_ho_causes[IPAC_HO_RQD_CAUSE_MAX];
+extern const struct value_string oc2gbts_rsl_ho_causes[IPAC_HO_RQD_CAUSE_MAX];
 
 enum pdch_cs {
 	PDCH_CS_1,
@@ -77,7 +77,7 @@ enum pdch_cs {
 	_NUM_PDCH_CS
 };
 
-const uint8_t pdch_msu_size[_NUM_PDCH_CS];
+extern const uint8_t pdch_msu_size[_NUM_PDCH_CS];
 
 /* OC2G default parameters */
 #define OC2G_BTS_MAX_CELL_SIZE_DEFAULT	166	/* 166 qbits is default  value */
diff --git a/src/osmo-bts-sysmo/femtobts.h b/src/osmo-bts-sysmo/femtobts.h
index 9163ebbfa..b048fc4e0 100644
--- a/src/osmo-bts-sysmo/femtobts.h
+++ b/src/osmo-bts-sysmo/femtobts.h
@@ -68,25 +68,25 @@ enum uperfemto_clk_src {
 };
 #endif
 
-const enum l1prim_type femtobts_l1prim_type[GsmL1_PrimId_NUM];
-const struct value_string femtobts_l1prim_names[GsmL1_PrimId_NUM+1];
-const GsmL1_PrimId_t femtobts_l1prim_req2conf[GsmL1_PrimId_NUM];
+extern const enum l1prim_type femtobts_l1prim_type[GsmL1_PrimId_NUM];
+extern const struct value_string femtobts_l1prim_names[GsmL1_PrimId_NUM+1];
+extern const GsmL1_PrimId_t femtobts_l1prim_req2conf[GsmL1_PrimId_NUM];
 
-const enum l1prim_type femtobts_sysprim_type[SuperFemto_PrimId_NUM];
-const struct value_string femtobts_sysprim_names[SuperFemto_PrimId_NUM+1];
-const SuperFemto_PrimId_t femtobts_sysprim_req2conf[SuperFemto_PrimId_NUM];
+extern const enum l1prim_type femtobts_sysprim_type[SuperFemto_PrimId_NUM];
+extern const struct value_string femtobts_sysprim_names[SuperFemto_PrimId_NUM+1];
+extern const SuperFemto_PrimId_t femtobts_sysprim_req2conf[SuperFemto_PrimId_NUM];
 
-const struct value_string femtobts_l1sapi_names[GsmL1_Sapi_NUM+1];
-const struct value_string femtobts_l1status_names[GSML1_STATUS_NUM+1];
+extern const struct value_string femtobts_l1sapi_names[GsmL1_Sapi_NUM+1];
+extern const struct value_string femtobts_l1status_names[GSML1_STATUS_NUM+1];
 
-const struct value_string femtobts_tracef_names[29];
-const struct value_string femtobts_tracef_docs[29];
+extern const struct value_string femtobts_tracef_names[29];
+extern const struct value_string femtobts_tracef_docs[29];
 
-const struct value_string femtobts_tch_pl_names[15];
-const struct value_string femtobts_chcomb_names[8];
-const struct value_string femtobts_clksrc_names[10];
+extern const struct value_string femtobts_tch_pl_names[15];
+extern const struct value_string femtobts_chcomb_names[8];
+extern const struct value_string femtobts_clksrc_names[10];
 
-const struct value_string femtobts_dir_names[6];
+extern const struct value_string femtobts_dir_names[6];
 
 enum pdch_cs {
 	PDCH_CS_1,
@@ -105,6 +105,6 @@ enum pdch_cs {
 	_NUM_PDCH_CS
 };
 
-const uint8_t pdch_msu_size[_NUM_PDCH_CS];
+extern const uint8_t pdch_msu_size[_NUM_PDCH_CS];
 
 #endif /* FEMTOBTS_H */
diff --git a/tests/sysmobts/Makefile.am b/tests/sysmobts/Makefile.am
index 0829ca528..53180d112 100644
--- a/tests/sysmobts/Makefile.am
+++ b/tests/sysmobts/Makefile.am
@@ -13,5 +13,6 @@ sysmobts_test_SOURCES = sysmobts_test.c $(top_srcdir)/src/osmo-bts-sysmo/utils.c
 		$(top_srcdir)/src/osmo-bts-sysmo/calib_file.c \
 		$(top_srcdir)/src/osmo-bts-sysmo/calib_fixup.c \
 		$(top_srcdir)/src/osmo-bts-sysmo/misc/sysmobts_par.c \
+		$(top_srcdir)/src/osmo-bts-sysmo/femtobts.c \
 		$(top_srcdir)/src/osmo-bts-sysmo/eeprom.c
 sysmobts_test_LDADD = $(top_builddir)/src/common/libbts.a $(LIBOSMOABIS_LIBS) $(LDADD)