diff --git a/.gitignore b/.gitignore
index 496a5da..9f3c376 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,9 +6,7 @@ z*
 *~
 *.xlsx
 *.stackdump
-direwolf.conf
 *.wav
-fsk_fast_filter.h
 
 
 # Object files
@@ -41,6 +39,26 @@ fsk_fast_filter.h
 *.x86_64
 *.hex
 
+# Binaries, other build results
+
+aclients
+atest
+decode_aprs
+direwolf
+gen_fff
+gen_packets
+ll2utm
+log2gpx
+text2tt
+tt2text
+ttcalc
+utm2ll
+
+direwolf.conf
+fsk_fast_filter.h
+direwolf.desktop
+
+
 # =========================
 # Operating System Files
 # =========================
diff --git a/Makefile.linux b/Makefile.linux
index 0949eb7..9d47877 100644
--- a/Makefile.linux
+++ b/Makefile.linux
@@ -327,10 +327,10 @@ gen_packets : gen_packets.c ax25_pad.c hdlc_send.c fcs_calc.c gen_tone.c morse.c
 
 # Unit test for AFSK demodulator
 
-atest : atest.c fsk_fast_filter.h demod.c demod_afsk.c demod_9600.c \
-		dsp.o hdlc_rec.c hdlc_rec2.o multi_modem.o rrbb.o \
-		fcs_calc.c ax25_pad.c decode_aprs.c dwgpsnmea.o \
-		dwgps.o dwgpsd.o serial_port.o telemetry.c latlong.c symbols.c tt_text.c textcolor.c \
+atest : atest.c demod.o demod_afsk.o demod_9600.o \
+		dsp.o hdlc_rec.o hdlc_rec2.o multi_modem.o rrbb.o \
+		fcs_calc.o ax25_pad.o decode_aprs.o dwgpsnmea.o \
+		dwgps.o dwgpsd.o serial_port.o telemetry.o latlong.o symbols.o tt_text.o textcolor.o \
 		misc.a
 	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
 
@@ -683,6 +683,7 @@ kisstest : kiss_frame.c
 
 #  -----------------------------  Manual tests and experiments  ---------------------------
 
+# These are not included in a normal build.  Might be broken.
 
 # Unit test for IGate
 
@@ -690,19 +691,23 @@ itest : igate.c textcolor.c ax25_pad.c fcs_calc.c textcolor.o misc.a
 	$(CC) $(CFLAGS) -DITEST -o $@ $^
 	./itest
 
-# Unit test for UDP reception with AFSK demodulator
+# Unit test for UDP reception with AFSK demodulator.
+# Temporary during development.  Might not be useful anymore.
 
-udptest : udp_test.c demod.c dsp.c demod_afsk.c demod_9600.c hdlc_rec.c hdlc_rec2.c multi_modem.c rrbb.c 
-		fcs_calc.c ax25_pad.c decode_aprs.c symbols.c textcolor.c misc.a
+udptest : udp_test.c demod.o dsp.o demod_afsk.o demod_9600.o hdlc_rec.o hdlc_rec2.o multi_modem.o rrbb.o \
+		fcs_calc.o ax25_pad.o decode_aprs.o symbols.o textcolor.o misc.a
 	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
 	./udptest
 
+# For demodulator tweaking experiments.
+# Dependencies of demod*.c, rather than .o, are intentional.
+
 demod.o : tune.h
 demod_afsk.o : tune.h
 demod_9600.o : tune.h
 
-testagc : atest.c demod.c dsp.c demod_afsk.c demod_9600.c hdlc_rec.c hdlc_rec2.o multi_modem.o rrbb.o \
-		fcs_calc.c ax25_pad.c decode_aprs.c telemetry.c latlong.c symbols.c tune.h textcolor.c misc.a
+testagc : atest.c demod.c dsp.c demod_afsk.c demod_9600.c hdlc_rec.o hdlc_rec2.o multi_modem.o rrbb.o \
+		fcs_calc.o ax25_pad.o decode_aprs.o telemetry.o latlong.o symbols.o tune.h textcolor.o misc.a
 	$(CC) $(CFLAGS) -o atest $^ $(LDFLAGS)
 	./atest 02_Track_2.wav | grep "packets decoded in" > atest.out
 
diff --git a/aclients.c b/aclients.c
index a579285..fe5e93c 100644
--- a/aclients.c
+++ b/aclients.c
@@ -67,6 +67,7 @@
 #include <sys/types.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
+#include <arpa/inet.h>
 #include <netinet/in.h>
 #include <netinet/tcp.h>
 #include <fcntl.h>
diff --git a/audio.c b/audio.c
index d5fcdcd..84aa854 100644
--- a/audio.c
+++ b/audio.c
@@ -1134,7 +1134,7 @@ int audio_flush (int a)
 {
 #if USE_ALSA
 	int k;
-	char *psound;
+	unsigned char *psound;
 	int retries = 10;
 	snd_pcm_status_t *status;
 
diff --git a/config.c b/config.c
index 860dc8d..5115a97 100644
--- a/config.c
+++ b/config.c
@@ -1233,7 +1233,7 @@ void config_init (char *fname, struct audio_s *p_audio_config,
 		  /* Later, we check for valid letters and no more than one letter if + specified. */
 
 	          for (pc = t; *pc != '\0'; pc++) {
-		    if ( ! isalpha(*pc) && ! *pc == '+') {
+		    if ( ! isalpha(*pc) && ! (*pc == '+')) {
 	              text_color_set(DW_COLOR_ERROR);
                       dw_printf ("Line %d: Demodulator type can only contain letters and + character.\n", line);
 		    }
diff --git a/demod_afsk.c b/demod_afsk.c
index c5d248a..b769e21 100644
--- a/demod_afsk.c
+++ b/demod_afsk.c
@@ -720,7 +720,7 @@ static void emit_macro (char *name, int size, float *coeff)
 	dw_printf ("\n");
 }
 
-int main ()
+int main (void)
 {
 	//int n;
 	char fff_profile;
diff --git a/dwgpsd.c b/dwgpsd.c
index 5fc97bf..37688ff 100644
--- a/dwgpsd.c
+++ b/dwgpsd.c
@@ -41,6 +41,7 @@
 #include <string.h>
 #include <errno.h>
 #include <time.h>
+#include <math.h>
 
 #if __WIN32__
 #error Not for Windows
diff --git a/igate.c b/igate.c
index 080c30e..16041b6 100644
--- a/igate.c
+++ b/igate.c
@@ -81,6 +81,7 @@
 #include <sys/types.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
+#include <arpa/inet.h>
 #include <netinet/in.h>
 #include <netinet/tcp.h>
 #endif
diff --git a/kiss.c b/kiss.c
index 0007d1f..db68d69 100644
--- a/kiss.c
+++ b/kiss.c
@@ -685,7 +685,7 @@ void kiss_send_rec_packet (int chan, unsigned char *fbuf,  int flen)
 	    text_color_set(DW_COLOR_DEBUG);
 	    dw_printf ("\n");
 	    dw_printf ("Packet content before adding KISS framing and any escapes:\n");
-	    hex_dump ((char*)fbuf, flen);
+	    hex_dump (fbuf, flen);
 	  }
 
 	  kiss_len = kiss_encapsulate (stemp, flen+1, kiss_buff);
diff --git a/kissnet.c b/kissnet.c
index 357c582..e377657 100644
--- a/kissnet.c
+++ b/kissnet.c
@@ -511,7 +511,7 @@ void kissnet_send_rec_packet (int chan, unsigned char *fbuf, int flen)
 	    text_color_set(DW_COLOR_DEBUG);
 	    dw_printf ("\n");
 	    dw_printf ("Packet content before adding KISS framing and any escapes:\n");
-	    hex_dump ((char*)fbuf, flen);
+	    hex_dump (fbuf, flen);
 	  }
 
 	  kiss_len = kiss_encapsulate (stemp, flen+1, kiss_buff);
diff --git a/ttcalc.c b/ttcalc.c
index b122be4..17538e3 100644
--- a/ttcalc.c
+++ b/ttcalc.c
@@ -57,6 +57,7 @@
 #include <sys/types.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
+#include <arpa/inet.h>
 #include <netinet/in.h>
 #include <netinet/tcp.h>
 #include <sys/errno.h>