Update Makefile and add config.mk

Makefile

@@ -1,30 +1,16 @@
-PREFIX  := /usr/local
-CC      := cc
-CFLAGS  := -pedantic -Wall -Wno-deprecated-declarations -Os
-LDFLAGS := -lX11
-PULSEFLAGS := -lpulse
-NO_X := 0
-
-ifeq ($(NO_X), 1)
-	CFLAGS := $(CFLAGS) -DNO_X
-endif
-
-# FreeBSD (uncomment)
-#LDFLAGS += -L/usr/local/lib -I/usr/local/include
-# # OpenBSD (uncomment)
-#LDFLAGS += -L/usr/X11R6/lib -I/usr/X11R6/include
+include config.mk
 
 all: options dwmblocks
 
 options:
 	@echo dwmblocks build options:
-	@echo "CFLAGS  = ${CFLAGS}"
+	@echo "CFLAGS  = ${CFLAGS} ${NO_X}"
 	@echo "LDFLAGS = ${LDFLAGS}"
 	@echo "CC      = ${CC}"
 	@echo "PULSEFLAGS = ${PULSEFLAGS}"
 
 dwmblocks: dwmblocks.c pulse-listener.c blocks.def.h blocks.h
-	${CC} -o dwmblocks dwmblocks.c pulse-listener.c ${CFLAGS} ${PULSEFLAGS} ${LDFLAGS}
+	${CC} ${NO_X} -o dwmblocks dwmblocks.c pulse-listener.c ${CFLAGS} ${PULSEFLAGS} ${LDFLAGS}
 
 blocks.h:
 	cp blocks.def.h $@