diff --git a/Makefile b/Makefile
index ab251f4..0f59bbd 100644
--- a/Makefile
+++ b/Makefile
@@ -1,36 +1,77 @@
 PROGNAME=dump1090
 
-# Try to autodetect available libraries if no explicit setting was used
-
-ifndef RTLSDR
-  ifdef RTLSDR_PREFIX
-    RTLSDR := yes
-  else
-    RTLSDR := $(shell pkg-config --exists librtlsdr && echo "yes" || echo "no")
-  endif
-endif
-
-ifndef BLADERF
-  BLADERF := $(shell pkg-config --exists libbladeRF && echo "yes" || echo "no")
-endif
-
-ifndef HACKRF
-  HACKRF := $(shell pkg-config --exists libhackrf && echo "yes" || echo "no")
-endif
-
-ifndef LIMESDR
-  LIMESDR := $(shell pkg-config --exists LimeSuite && echo "yes" || echo "no")
-endif
-
 DUMP1090_VERSION ?= unknown
 
 CPPFLAGS += -DMODES_DUMP1090_VERSION=\"$(DUMP1090_VERSION)\" -DMODES_DUMP1090_VARIANT=\"dump1090-fa\"
 
 DIALECT = -std=c11
 CFLAGS += $(DIALECT) -O3 -g -Wall -Wmissing-declarations -Werror -W -D_DEFAULT_SOURCE -fno-common
-LIBS = -lpthread -lm -lrt
+LIBS = -lpthread -lm
 SDR_OBJ = sdr.o fifo.o sdr_ifile.o
 
+# Try to autodetect available libraries via pkg-config if no explicit setting was used
+PKGCONFIG=$(shell pkg-config --version >/dev/null 2>&1 && echo "yes" || echo "no")
+ifeq ($(PKGCONFIG), yes)
+  ifndef RTLSDR
+    ifdef RTLSDR_PREFIX
+      RTLSDR := yes
+    else
+      RTLSDR := $(shell pkg-config --exists librtlsdr && echo "yes" || echo "no")
+    endif
+  endif
+
+  ifndef BLADERF
+    BLADERF := $(shell pkg-config --exists libbladeRF && echo "yes" || echo "no")
+  endif
+
+  ifndef HACKRF
+    HACKRF := $(shell pkg-config --exists libhackrf && echo "yes" || echo "no")
+  endif
+
+  ifndef LIMESDR
+    LIMESDR := $(shell pkg-config --exists LimeSuite && echo "yes" || echo "no")
+  endif
+else
+  # pkg-config not available. Only use explicitly enabled libraries.
+  RTLSDR ?= no
+  BLADERF ?= no
+  HACKRF ?= no
+  LIMESDR ?= no
+endif
+
+UNAME := $(shell uname)
+
+ifeq ($(UNAME), Linux)
+  CFLAGS += -D_DEFAULT_SOURCE
+  LIBS += -lrt
+  LIBS_USB += -lusb-1.0
+endif
+
+ifeq ($(UNAME), Darwin)
+  ifneq ($(shell sw_vers -productVersion | egrep '^10\.([0-9]|1[01])\.'),) # Mac OS X ver <= 10.11
+    CFLAGS += -DMISSING_GETTIME
+    COMPAT += compat/clock_gettime/clock_gettime.o
+  endif
+  CFLAGS += -DMISSING_NANOSLEEP
+  COMPAT += compat/clock_nanosleep/clock_nanosleep.o
+  LIBS_USB += -lusb-1.0
+endif
+
+ifeq ($(UNAME), OpenBSD)
+  CFLAGS += -DMISSING_NANOSLEEP
+  COMPAT += compat/clock_nanosleep/clock_nanosleep.o
+  LIBS_USB += -lusb-1.0
+endif
+
+ifeq ($(UNAME), FreeBSD)
+  CFLAGS += -D_DEFAULT_SOURCE
+  LIBS += -lrt
+  LIBS_USB += -lusb
+endif
+
+RTLSDR ?= yes
+BLADERF ?= yes
+
 ifeq ($(RTLSDR), yes)
   SDR_OBJ += sdr_rtlsdr.o
   CPPFLAGS += -DENABLE_RTLSDR
@@ -38,9 +79,9 @@ ifeq ($(RTLSDR), yes)
   ifdef RTLSDR_PREFIX
     CPPFLAGS += -I$(RTLSDR_PREFIX)/include
     ifeq ($(STATIC), yes)
-      LIBS_SDR += -L$(RTLSDR_PREFIX)/lib -Wl,-Bstatic -lrtlsdr -Wl,-Bdynamic -lusb-1.0
+      LIBS_SDR += -L$(RTLSDR_PREFIX)/lib -Wl,-Bstatic -lrtlsdr -Wl,-Bdynamic $(LIBS_USB)
     else
-      LIBS_SDR += -L$(RTLSDR_PREFIX)/lib -lrtlsdr -lusb-1.0
+      LIBS_SDR += -L$(RTLSDR_PREFIX)/lib -lrtlsdr $(LIBS_USB)
     endif
   else
     CFLAGS += $(shell pkg-config --cflags librtlsdr)
diff --git a/README.md b/README.md
index 14e013a..abdf898 100644
--- a/README.md
+++ b/README.md
@@ -90,3 +90,14 @@ libhackrf.
 
 ``make LIMESDR=no`` will disable LimeSDR support and remove the dependency on
 libLimeSuite.
+
+## Building on OSX
+
+Minimal testing, YMMV.
+
+```
+$ brew install librtlsdr
+$ brew install pkg-config
+$ make
+```
+
diff --git a/compat/clock_gettime/clock_gettime.h b/compat/clock_gettime/clock_gettime.h
index 83fdac7..3c4c29b 100644
--- a/compat/clock_gettime/clock_gettime.h
+++ b/compat/clock_gettime/clock_gettime.h
@@ -3,9 +3,17 @@
 
 #include <mach/mach_time.h> // Apple-only, but this isn't inclued on other BSDs
 
+#ifdef __OpenBSD__
 #ifdef _CLOCKID_T_DEFINED_
 #define CLOCKID_T
 #endif
+#endif
+
+#ifdef __APPLE__
+#ifdef CLOCK_MONOTONIC
+#define CLOCKID_T
+#endif
+#endif
 
 #ifndef CLOCKID_T
 #define CLOCKID_T
diff --git a/compat/clock_nanosleep/clock_nanosleep.h b/compat/clock_nanosleep/clock_nanosleep.h
index 9a8da5d..34eb801 100644
--- a/compat/clock_nanosleep/clock_nanosleep.h
+++ b/compat/clock_nanosleep/clock_nanosleep.h
@@ -1,9 +1,17 @@
 #ifndef CLOCK_NANOSLEEP_H
 #define CLOCK_NANOSLEEP_H
 
+#ifdef __OpenBSD__
 #ifdef _CLOCKID_T_DEFINED_
 #define CLOCKID_T
 #endif
+#endif
+
+#ifdef __APPLE__
+#ifdef CLOCK_MONOTONIC
+#define CLOCKID_T
+#endif
+#endif
 
 #ifndef CLOCKID_T
 #define CLOCKID_T
diff --git a/compat/compat.h b/compat/compat.h
index 5905e10..f0525bb 100644
--- a/compat/compat.h
+++ b/compat/compat.h
@@ -18,6 +18,9 @@
 # define le16toh(x) OSSwapLittleToHostInt16(x)
 # define le32toh(x) OSSwapLittleToHostInt32(x)
 
+#elif defined(__FreeBSD__)
+#include <sys/endian.h>
+
 #else // other platforms
 
 # include <endian.h>