Fix the LIBS for using gpsd.

YSFGateway/Makefile

@@ -1,13 +1,14 @@
 CC      = gcc
 CXX     = g++
 
-# Use the following CFLAGS if you don't want to use gpsd.
+# Use the following CFLAGS and LIBS if you don't want to use gpsd.
 CFLAGS  = -g -O3 -Wall -std=c++0x -pthread
+LIBS    = -lm -lpthread
 
-# Use the following CFLAGS if you do want to use gpsd.
+# Use the following CFLAGS and LIBS if you do want to use gpsd.
 CFLAGS  = -g -O3 -Wall -DUSE_GPSD -std=c++0x -pthread
-
 LIBS    = -lm -lpthread -lgps
+
 LDFLAGS = -g
 
 OBJECTS = APRSWriter.o Conf.o CRC.o DTMF.o FCSNetwork.o Golay24128.o GPS.o Log.o StopWatch.o Sync.o Thread.o Timer.o \