Add makefile in GNU make format for OS X.

GNUmakefile

@@ -0,0 +1,34 @@
+CFLAGS := -Wall -Wextra -Werror -g -O0
+LIB_SRCS := \
+	pack.c \
+	connection.c \
+	request.c \
+	log.c \
+	hashtable.c \
+	utils.c \
+	sbuf/sbuf.c \
+	transport/socket.c \
+	backend/fs.c
+	
+SERVER_SRCS := \
+	example/server.c
+	
+LIB_OBJS := $(LIB_SRCS:.c=.o)
+SERVER_OBJS := $(SERVER_SRCS:.c=.o)
+
+LIB := lib9p.dylib
+SERVER := server
+	
+all: $(LIB) $(SERVER)
+	
+$(LIB): $(LIB_OBJS)
+	cc -dynamiclib $^ -o $@
+	
+$(SERVER): $(SERVER_OBJS)
+	cc $< -o $(SERVER) -L. -l9p
+	
+clean:
+	rm -f $(LIB_OBJS) $(SERVER_OBJS)
+	
+.c.o:
+	$(CC) $(CFLAGS) -c $< -o $@