diff --git a/Makefile.macosx b/Makefile.macosx
index 1c111c6..3cc03df 100644
--- a/Makefile.macosx
+++ b/Makefile.macosx
@@ -24,7 +24,7 @@
 # 3. Removed fsk_fast_filter.h from atest receipe, clang compiler was having
 #    a hissy fit. Not check with GCC.
 
-APPS := direwolf decode_aprs text2tt tt2text ll2utm utm2ll aclients atest log2gpx gen_packets ttcalc
+APPS := direwolf decode_aprs text2tt tt2text ll2utm utm2ll aclients atest log2gpx gen_packets ttcalc kissutil
 
 all :  $(APPS) direwolf.conf
 	@echo " "
@@ -86,86 +86,14 @@ CFLAGS += -D_BSD_SOURCE
 
 # $(info $$CC is [${CC}])
 
-#
-# The DSP filters spend a lot of time spinning around in little
-# loops multiplying and adding arrays of numbers.  The Intel "SSE"
-# instructions, introduced in 1999 with the Pentium III series,
-# can speed this up considerably.
-#
-# SSE2 instructions, added in 2000, don't seem to offer any advantage.
-#
-#
-# Let's take a look at the effect of the compile options.
-#
-#
-# Times are elapsed time to process Track 2 of the TNC test CD.
-#
-# i.e.   "./atest 02_Track_2.wav"
-# Default demodulator type is new "E" added for version 1.2.
-#
 
-#
-# ---------- x86 (32 bit) ----------
-#
-
-#
-# gcc 4.6.3 running on Ubuntu 12.04.05.
-# Intel(R) Celeron(R) CPU 2.53GHz.  Appears to have only 32 bit instructions.
-# Probably from around 2004 or 2005.
-#
-# When gcc is generating code for a 32 bit x86 target, it assumes the ancient
-# i386 processor.  This is good for portability but bad for performance.
-#
-# The code can run considerably faster by taking advantage of the SSE instructions
-# available in the Pentium 3 or later.
-#
-#       seconds options		comments
-#       ------  -------		--------
-#         524
-#         183	-O2
-#         182	-O3
-#         183	-O3 -ffast-math  	(should be same as -Ofast)
-#         184	-Ofast
-#         189	-O3 -ffast-math -march=pentium
-#         122	-O3 -ffast-math -msse
-#         122	-O3 -ffast-math -march=pentium -msse
-#         121	-O3 -ffast-math -march=pentium3   (this implies -msse)
-#         120	-O3 -ffast-math -march=native
-#
-# Note that "-march=native" is essentially the same as "-march=pentium3."
-#
-
-# If the compiler is generating code for the i386 target, we can
-# get much better results by telling it we have at least a Pentium 3.
+# If the compiler is generating code for a 32 bit target (-m32), we can
+# get much better results by telling it we have at least a Pentium 3
+# which hass the SSE instructions.
 
 CFLAGS += -march=core2 -msse4.1 -std=gnu99
 #CFLAGS += -march=pentium3 -sse
 
-#
-# gcc 4.8.2 running on Ubuntu 14.04.1.
-# Intel Core 2 Duo from around 2007 or 2008.
-#
-# 64 bit target implies that we have SSE and probably even better vector instructions.
-#
-#       seconds options		comments
-#       ------  -------		--------
-#         245
-#          75	-01
-#          72 	-02
-#          71  	-03
-#          73  	-O3 -march=native
-#          42	-O3 -ffast-math
-#          42  	-Ofast			(note below)
-#          40	-O3 -ffast-math -march=native
-#
-#
-# Note that "-Ofast" is a newer option roughly equivalent to "-O3 -ffast-math".
-# I use the longer form because it is compatible with older compilers.
-#
-# Why don't I don't have "-march=native?"
-# Older compilers don't recognize "native" as one of the valid options.
-# One article said it was added with gcc 4.2 but I haven't verified that.
-#
 
 # Add -ffastmath in only if compiler version recognizes it.
 
@@ -174,22 +102,6 @@ ifneq ($(useffast),)
 CFLAGS += -ffast-math
 endif
 
-#
-# You would expect "-march=native" to produce the fastest code.
-# Why don't I use it here?
-#
-#	1. In my benchmarks, above, it has a negligible impact if any at all.
-#	2. Some older versions of gcc don't recognize "native" as a valid choice.
-#	3. Results are less portable.  Not a consideration if you are
-#		building only for your own use but very important for anyone
-#		redistributing a "binary" version.
-#
-# If you are planning to distribute the binary version to other
-# people (in some ham radio software collection, RPM, or DEB package),
-# avoid # fine tuning it for your particular computer.  It could
-# cause compatibility issues for those with older computers.
-#
-
 #CFLAGS += -D_FORTIFY_SOURCE
 
 # Use PortAudio Library
@@ -296,20 +208,15 @@ direwolf.conf : generic.conf
 
 
 # Where should we install it?
-
-# My understanding, of the convention, is that something you compile
-# from source, that is not a standard part of the operating system,
-# should go in /usr/local/bin.
-
-# This is a step in the right direction but not sufficient to use /usr instead.
+# Macports typically installs in /opt/local so maybe you want to use that instead.
 
 INSTALLDIR := /usr/local
+#INSTALLDIR := /opt/local
 
 # TODO:  Test this better.
 
-# Optional installation into /usr/local/...
+# Optional installation into INSTALLDIR.
 # Needs to be run as root or with sudo.
-# TODO: Review file locations.
 
 # Command to "install" to system directories.  "install" for Linux.  "ginstall" for Mac.
 
@@ -318,8 +225,7 @@ INSTALL=ginstall
 .PHONY: install
 install : $(APPS) direwolf.conf tocalls.txt symbols-new.txt symbolsX.txt dw-icon.png
 #
-# Applications, not installed with package manager, normally go in /usr/local/bin.
-# /usr/bin is used instead when installing from .DEB or .RPM package.
+# Applications.
 #
 	$(INSTALL) direwolf $(INSTALLDIR)/bin
 	$(INSTALL) decode_aprs $(INSTALLDIR)/bin
@@ -332,6 +238,7 @@ install : $(APPS) direwolf.conf tocalls.txt symbols-new.txt symbolsX.txt dw-icon
 	$(INSTALL) gen_packets $(INSTALLDIR)/bin
 	$(INSTALL) atest $(INSTALLDIR)/bin
 	$(INSTALL) ttcalc $(INSTALLDIR)/bin
+	$(INSTALL) kissutil $(INSTALLDIR)/bin
 	$(INSTALL) dwespeak.sh $(INSTALLDIR)/bin
 #
 # Telemetry Toolkit executables.   Other .conf and .txt files will go into doc directory.
@@ -347,10 +254,11 @@ install : $(APPS) direwolf.conf tocalls.txt symbols-new.txt symbolsX.txt dw-icon
 #
 # Misc. data such as "tocall" to system mapping.
 #
-	$(INSTALL) -D --mode=644 tocalls.txt /usr/share/direwolf/tocalls.txt
-	$(INSTALL) -D --mode=644 symbols-new.txt /usr/share/direwolf/symbols-new.txt
-	$(INSTALL) -D --mode=644 symbolsX.txt /usr/share/direwolf/symbolsX.txt
-	$(INSTALL) -D --mode=644 dw-icon.png /usr/share/direwolf/dw-icon.png
+	$(INSTALL) -D --mode=644 tocalls.txt $(INSTALLDIR)/share/direwolf/tocalls.txt
+	$(INSTALL) -D --mode=644 symbols-new.txt $(INSTALLDIR)/share/direwolf/symbols-new.txt
+	$(INSTALL) -D --mode=644 symbolsX.txt $(INSTALLDIR)/share/direwolf/symbolsX.txt
+	$(INSTALL) -D --mode=644 dw-icon.png $(INSTALLDIR)/share/direwolf/dw-icon.png
+
 #
 # Documentation.  Various plain text files and PDF.
 #
@@ -535,6 +443,14 @@ aclients : aclients.c ax25_pad.c fcs_calc.c textcolor.c
 	$(CC) $(CFLAGS) -g -o $@ $^
 
 
+# Talk to a KISS TNC.
+# Note:  kiss_frame.c has conditional compilation on KISSUTIL.
+
+kissutil : kissutil.c kiss_frame.c ax25_pad.o fcs_calc.o textcolor.o serial_port.o dtime_now.o sock.o misc.a
+	$(CC) $(CFLAGS) -g -DKISSUTIL -o $@ $^ $(LDFLAGS)
+
+
+
 # Touch Tone to Speech sample application.
 
 ttcalc : ttcalc.o ax25_pad.o fcs_calc.o textcolor.o
@@ -568,6 +484,7 @@ dist-mac: direwolf decode_aprs text2tt tt2text ll2utm utm2ll aclients log2gpx ge
 	$(INSTALLDIR)/bin/gen_packets \
 	$(INSTALLDIR)/bin/atest \
 	$(INSTALLDIR)/bin/ttcalc \
+	$(INSTALLDIR)/bin/kissutil \
 	$(INSTALLDIR)/bin/dwespeak.sh \
 	$(INSTALLDIR)/share/direwolf/tocalls.txt \
 	$(INSTALLDIR)/share/direwolf/config/direwolf.conf \
@@ -588,6 +505,7 @@ dist-mac: direwolf decode_aprs text2tt tt2text ll2utm utm2ll aclients log2gpx ge
 	$(INSTALLDIR)/man/man1/decode_aprs.1 \
 	$(INSTALLDIR)/man/man1/direwolf.1 \
 	$(INSTALLDIR)/man/man1/gen_packets.1 \
+	$(INSTALLDIR)/man/man1/kissutil.1 \
 	$(INSTALLDIR)/man/man1/ll2utm.1 \
 	$(INSTALLDIR)/man/man1/log2gpx.1 \
 	$(INSTALLDIR)/man/man1/text2tt.1 \
diff --git a/decode_aprs.c b/decode_aprs.c
index 3165ddd..60ddbd2 100644
--- a/decode_aprs.c
+++ b/decode_aprs.c
@@ -3706,8 +3706,12 @@ static int data_extension_comment (decode_aprs_t *A, char *pdext)
  *
  *		Windows version:  File must be in current working directory.
  *
- *		Linux version: Search order is current working directory
- *			then /usr/share/direwolf directory.
+ *		Linux version: Search order is current working directory then
+ *			/usr/local/share/direwolf
+ *			/usr/share/direwolf/tocalls.txt
+ *
+ *		Mac: Like Linux and then
+ *			/opt/local/share/direwolf
  *
  *------------------------------------------------------------------*/
 
@@ -3730,11 +3734,20 @@ static struct tocalls_s {
 static int num_tocalls = 0;
 
 // Make sure the array is null terminated.
+// If search order is changed, do the same in symbols.c
+
 static const char *search_locations[] = {
 	(const char *) "tocalls.txt",
 #ifndef __WIN32__
-	(const char *) "/usr/share/direwolf/tocalls.txt",
 	(const char *) "/usr/local/share/direwolf/tocalls.txt",
+	(const char *) "/usr/share/direwolf/tocalls.txt",
+#endif
+#if __APPLE__
+	// https://groups.yahoo.com/neo/groups/direwolf_packet/conversations/messages/2458
+	// Adding the /opt/local tree since macports typically installs there.  Users might want their
+	// INSTALLDIR (see Makefile.macosx) to mirror that.  If so, then we need to search the /opt/local
+	// path as well.
+	(const char *) "/opt/local/share/direwolf/tocalls.txt",
 #endif
 	(const char *) NULL
 };
diff --git a/direwolf.h b/direwolf.h
index b12b0b7..5c5c295 100644
--- a/direwolf.h
+++ b/direwolf.h
@@ -135,6 +135,22 @@
 // which breaks things.
 // Maybe it should just go in ptt.c as originally suggested.
 
+// #define __DARWIN_C_LEVEL  __DARWIN_C_FULL
+
+// There is a more involved patch here:
+//  https://groups.yahoo.com/neo/groups/direwolf_packet/conversations/messages/2458
+
+#ifndef _DARWIN_C_SOURCE
+#define _DARWIN_C_SOURCE
+#endif
+
+// Defining _DARWIN_C_SOURCE ensures that the definition for the cfmakeraw function (or similar)
+// are pulled in through the include file <sys/termios.h>.
+
+#ifdef __DARWIN_C_LEVEL
+#undef __DARWIN_C_LEVEL
+#endif
+
 #define __DARWIN_C_LEVEL  __DARWIN_C_FULL
 
 #endif
diff --git a/dtime_now.c b/dtime_now.c
index ac7f238..2c7e89b 100644
--- a/dtime_now.c
+++ b/dtime_now.c
@@ -20,6 +20,8 @@
 #include <sys/time.h>
 #endif
 
+#include <string.h>		// needed for Mac.
+
 
 /*------------------------------------------------------------------
  *
diff --git a/kissserial.c b/kissserial.c
index d9aedc2..9f185ef 100644
--- a/kissserial.c
+++ b/kissserial.c
@@ -105,15 +105,6 @@
 #include "xmit.h"
 
 
-#if __WIN32__
-typedef HANDLE MYFDTYPE;
-#define MYFDERROR INVALID_HANDLE_VALUE
-#else
-typedef int MYFDTYPE;
-#define MYFDERROR (-1)
-#endif
-
-
 /*
  * Save Configuration for later use.
  */
@@ -129,6 +120,7 @@ static kiss_frame_t kf;
 
 /*
  * The serial port device handle.
+ * MYFD... are defined in kissserial.h
  */
 
 static MYFDTYPE serialport_fd = MYFDERROR;
diff --git a/search_sdks.sh b/search_sdks.sh
old mode 100644
new mode 100755
diff --git a/symbols.c b/symbols.c
index ad3263c..208c327 100644
--- a/symbols.c
+++ b/symbols.c
@@ -261,11 +261,20 @@ static const struct {
 
 
 // Make sure the array is null terminated.
+// If search order is changed, do the same in decode_aprs.c
+
 static const char *search_locations[] = {
 	(const char *) "symbols-new.txt",
 #ifndef __WIN32__
-	(const char *) "/usr/share/direwolf/symbols-new.txt",
 	(const char *) "/usr/local/share/direwolf/symbols-new.txt",
+	(const char *) "/usr/share/direwolf/symbols-new.txt",
+#endif
+#if __APPLE__
+	// https://groups.yahoo.com/neo/groups/direwolf_packet/conversations/messages/2458
+	// Adding the /opt/local tree since macports typically installs there.  Users might want their
+	// INSTALLDIR (see Makefile.macosx) to mirror that.  If so, then we need to search the /opt/local
+	// path as well.
+	(const char *) "/opt/local/share/direwolf/symbols-new.txt",
 #endif
 	(const char *) NULL
 };