make it compile on FreeBSD

Makefile

@@ -1,26 +1,37 @@
-LDLIBS=-lwiringPi -lcrypt -lm -lrt
-CFLAGS=-g
+LDLIBS=-L. -lwiringPi -lcrypt -lm -lrt -lgpio
+CFLAGS=-g -I. -Wall -Werror -O2
 LDFLAGS=-g
 
 all: cc_chipid cc_read cc_write cc_erase
 
+test:
+	ls *.h *.c Makefile | entr sh -c 'make clean && make'
+
 clean:
 	rm -f cc_chipid cc_read cc_write cc_erase
 
-cc_erase : cc_erase.o CCDebugger.o
-	$(CC) $(LDFLAGS) -o $@ $^ $(LDLIBS)
+cc_erase: cc_erase.o CCDebugger.o libwiringPi.a
+	$(CC) $(LDFLAGS) -o $@ $> $(LDLIBS)
 
-cc_write : cc_write.o CCDebugger.o
-	$(CC) $(LDFLAGS) -o $@ $^ $(LDLIBS)
+cc_write: cc_write.o CCDebugger.o libwiringPi.a
+	$(CC) $(LDFLAGS) -o $@ $> $(LDLIBS)
 
-cc_read : cc_read.o CCDebugger.o
-	$(CC) $(LDFLAGS) -o $@ $^ $(LDLIBS)
+cc_read: cc_read.o CCDebugger.o libwiringPi.a
+	$(CC) $(LDFLAGS) -o $@ $> $(LDLIBS)
 
-cc_chipid : cc_chipid.o CCDebugger.o
-	$(CC) $(LDFLAGS) -o $@ $^ $(LDLIBS)
+cc_chipid: cc_chipid.o CCDebugger.o libwiringPi.a
+	$(CC) $(LDFLAGS) -o $@ $> $(LDLIBS)
 
-cc_chipid.o : cc_chipid.c CCDebugger.h
-	$(CC) $(CFLAGS) -c $*.c
+.SUFFIXES: .o
+.c.o:
+	#cc -o ${.TARGET} -c ${.IMPSRC}
+	$(CC) $(CFLAGS) -c $<
 
 CCDebugger.o : CCDebugger.c CCDebugger.h
 	$(CC) $(CFLAGS) -c $*.c
+
+wiringPi.o : wiringPi.c wiringPi.h
+	$(CC) $(CFLAGS) -c $*.c
+
+libwiringPi.a: wiringPi.o
+	$(AR) crs $@ $>