diff --git a/src/devices/bus/qbus/pc11.cpp b/src/devices/bus/qbus/pc11.cpp
index 395a0235388..26647204802 100644
--- a/src/devices/bus/qbus/pc11.cpp
+++ b/src/devices/bus/qbus/pc11.cpp
@@ -6,6 +6,7 @@
 
 ***************************************************************************/
 
+#include "emu.h"
 #include "pc11.h"
 
 
diff --git a/src/devices/machine/iwm.cpp b/src/devices/machine/iwm.cpp
index 3d1ff6f9b21..9c5002672e2 100644
--- a/src/devices/machine/iwm.cpp
+++ b/src/devices/machine/iwm.cpp
@@ -17,8 +17,10 @@ iwm_device::iwm_device(const machine_config &mconfig, const char *tag, device_t
 	applefdintf_device(mconfig, IWM, tag, owner, clock),
 	m_q3_clock(q3_clock)
 {
-	m_q3_fclk_ratio = double(clock)/double(q3_clock); // ~0.25
-	m_fclk_q3_ratio = double(q3_clock)/double(clock); // ~4
+	if (q3_clock != 0)
+		m_q3_fclk_ratio = double(clock)/double(q3_clock); // ~0.25
+	if (clock != 0)
+		m_fclk_q3_ratio = double(q3_clock)/double(clock); // ~4
 }
 
 u64 iwm_device::q3_to_fclk(u64 cycles) const
diff --git a/src/devices/machine/netlist.cpp b/src/devices/machine/netlist.cpp
index 38cda91fdfa..4422481dcd1 100644
--- a/src/devices/machine/netlist.cpp
+++ b/src/devices/machine/netlist.cpp
@@ -63,7 +63,7 @@ DEFINE_DEVICE_TYPE(NETLIST_STREAM_OUTPUT, netlist_mame_stream_output_device, "nl
 // Special netlist extension devices  ....
 // ----------------------------------------------------------------------------------------
 
-extern plib::dynlib_static_sym nl_static_solver_syms[];
+extern const plib::dynlib_static_sym nl_static_solver_syms[];
 
 static netlist::netlist_time_ext nltime_from_attotime(attotime t)
 {
diff --git a/src/devices/machine/spg290_cdservo.cpp b/src/devices/machine/spg290_cdservo.cpp
index 53415f093b5..651d5e16818 100644
--- a/src/devices/machine/spg290_cdservo.cpp
+++ b/src/devices/machine/spg290_cdservo.cpp
@@ -145,7 +145,7 @@ void spg290_cdservo_device::device_timer(emu_timer &timer, device_timer_id id, i
 		m_irq_cb(ASSERT_LINE);
 	}
 
-	if (m_cur_sector < m_seek_lba + SPG290_LEADIN_LEN and m_cur_sector < m_tot_sectors)
+	if ((m_cur_sector < m_seek_lba + SPG290_LEADIN_LEN) && (m_cur_sector < m_tot_sectors))
 		m_cur_sector++;
 }