Corrected Makefile. Thanks Paul Gules.

Makefile

@@ -9,13 +9,13 @@ strings.o : common/zmq_strings.c
 	$(CC) $(CFLAGS) -c $(LDFLAGS) common/zmq_strings.c -o strings.o
 
 zmq_chat_printer: strings.o printer/printer.c common/messages.h
-	$(CC) $(CFLAGS) $(LDFLAGS) strings.o printer/printer.c -o zmq_chat_printer
+	$(CC) $(CFLAGS) strings.o printer/printer.c $(LDFLAGS) -o zmq_chat_printer
 
 zmq_chat_poster: strings.o poster/poster.c common/messages.h
-	$(CC) $(CFLAGS) $(LDFLAGS) strings.o poster/poster.c -o zmq_chat_poster
+	$(CC) $(CFLAGS) strings.o poster/poster.c $(LDFLAGS) -o zmq_chat_poster
 
 zmq_chat_server: strings.o server/server.c common/messages.h
-	$(CC) $(CFLAGS) $(LDFLAGS) strings.o server/server.c -o zmq_chat_server
+	$(CC) $(CFLAGS) strings.o server/server.c $(LDFLAGS) -o zmq_chat_server
 
 clean:
-	rm -f zmq_chat_printer zmq_chat_poster zmq_chat_server strings.o
\ No newline at end of file
+	rm -f zmq_chat_printer zmq_chat_poster zmq_chat_server strings.o