Allow building on non-Linux Unix systems.

- Use pkg-config to find required libraries and include paths.
- Only include extra Linux libraries on Linux.
- Add libusb fallback code to hidapi.c

colorchord2/DisplayDMX.c

@@ -6,7 +6,7 @@
 #include <string.h>
 #include "parameters.h"
 #include <stdlib.h>
-#include <libusb-1.0/libusb.h>
+#include <libusb.h>
 #include "color.h"
 #include <math.h>
 #include <unistd.h>

colorchord2/DisplayUSB2812.c

@@ -6,7 +6,7 @@
 #include <string.h>
 #include "parameters.h"
 #include <stdlib.h>
-#include <libusb-1.0/libusb.h>
+#include <libusb.h>
 #include "color.h"
 #include <math.h>
 #include <unistd.h>

colorchord2/Makefile

@@ -7,18 +7,28 @@ WINGCC:= i686-w64-mingw32-gcc
 WINGCCFLAGS:= -g -DICACHE_FLASH_ATTR= -I../embeddedcommon -Icnfa -Irawdraw -I. -O1   #-O2 -Wl,--relax -Wl,--gc-sections -ffunction-sections -fdata-sections
 WINLDFLAGS:=-lwinmm -lgdi32 -lws2_32  -lsetupapi
 
-RAWDRAWLIBS:=-lX11 -lm -lpthread -lXinerama -lXext
-LDLIBS:=-lpthread -lasound -lm -lpulse-simple -lpulse -ludev -lrt
+#CFLAGS:=-g -O1 -flto -Wall -ffast-math -I../embeddedcommon -I.  -Icnfa -Irawdraw -DICACHE_FLASH_ATTR=
+CFLAGS:=-g -O1 -Wall -ffast-math -I../embeddedcommon -I.  -Icnfa -Irawdraw -DICACHE_FLASH_ATTR=
 
+ifneq ($(OS),Windows_NT)
+ifneq ($(shell uname),Darwin)
+RAWDRAWCFLAGS:=$(shell pkg-config --cflags x11 xinerama xext libusb-1.0)
+RAWDRAWLIBS:=-lm -lrt -pthread $(shell pkg-config --libs x11 xinerama xext libusb-1.0)
+CFLAGS+=$(RAWDRAWCFLAGS)
+endif
+endif
 
-CFLAGS:=-g -O1 -flto -Wall -ffast-math -I../embeddedcommon -I.  -Icnfa -Irawdraw -DICACHE_FLASH_ATTR=
-EXTRALIBS:=-lusb-1.0
+ifeq ($(shell uname),Linux)
+EXTRALIBS+=-ludev
+EXTRALIBS+=$(shell pkg-config --libs alsa)
+EXTRALIBS+=$(shell pkg-config --libs libpulse)
+EXTRALIBS+=$(shell pkg-config --libs libpulse-simple)
+endif
 
 OBJS:=main.o  dft.o decompose.o filter.o color.o notefinder.o util.o outdrivers.o $(OUTS) parameters.o chash.o hook.o ../embeddedcommon/DFT32.o configs.o
 
 colorchord : $(OBJS)
-	$(CC) -o $@ $^ $(CFLAGS) $(LDLIBS) $(EXTRALIBS) $(RAWDRAWLIBS)
-
+	$(CC) -o $@ $^ $(EXTRALIBS) $(RAWDRAWLIBS)
 
 colorchord.exe : main.c  dft.c decompose.c filter.c color.c notefinder.c util.c outdrivers.c parameters.c chash.c OutputVoronoi.c OutputProminent.c DisplayArray.c OutputLinear.c DisplayPie.c DisplayNetwork.c hook.c RecorderPlugin.c ../embeddedcommon/DFT32.c OutputCells.c configs.c hidapi.c DisplayHIDAPI.c
 	$(WINGCC) $(WINGCCFLAGS) -o $@ $^ $(WINLDFLAGS)