Use multithreading instead

Makefile

@@ -1,11 +1,11 @@
 CROSS_COMPILE ?= 
 CC := $(CROSS_COMPILE)gcc
 STRIP := $(CROSS_COMPILE)strip
-CFLAGS += -g -O2 -Wall
-LIBS = -pthread -static
+CFLAGS += -g -O2 -Wall -pthread
+LIBS = -static
 OBJ := CProxy
 
-all: proxy.o http.o request.o picohttpparser.o conf.o timeout.o kill.o help.o
+all: proxy.o http.o httpdns.o request.o picohttpparser.o conf.o timeout.o kill.o help.o
 	$(CC) $(CFLAGS) -o $(OBJ) $^ $(LIBS)
 .c.o:
 	$(CC) $(CFLAGS) -c $< $(LIBS)