Fix Linux compiler issues.

YSFGateway/APRSWriter.cpp

@@ -23,6 +23,7 @@
 #include <cstdio>
 #include <cassert>
 #include <cstring>
+#include <cmath>
 #include <ctime>
 
 CAPRSWriter::CAPRSWriter(const std::string& callsign, const std::string& suffix, const std::string& password, const std::string& address, unsigned int port) :
@@ -199,7 +200,7 @@ void CAPRSWriter::sendIdFrames()
 		::strcpy(desc, "MMDVM Voice");
 	}
 
-	char* band;
+	const char* band;
 	if (m_txFrequency >= 1200000000U)
 		band = "1.2";
 	else if (m_txFrequency >= 420000000U)

YSFGateway/APRSWriterThread.cpp

@@ -227,13 +227,13 @@ bool CAPRSWriterThread::connect()
 		return false;
 	}
 
-
 	length = m_socket.readLine(serverResponse, APRS_TIMEOUT);
 	if (length == 0) {
 		LogError("No reply from the APRS server after %u seconds", APRS_TIMEOUT);
 		m_socket.close();
 		return false;
 	}
+
 	if (length < 0) {
 		LogError("Error when reading from the APRS server");
 		m_socket.close();

YSFGateway/Makefile

@@ -1,7 +1,7 @@
 CC      = gcc
 CXX     = g++
 CFLAGS  = -g -O3 -Wall -std=c++0x -pthread
-LIBS    = -lpthread
+LIBS    = -lm -lpthread
 LDFLAGS = -g
 
 OBJECTS = APRSWriterThread.o APRSWriter.o Conf.o CRC.o Golay24128.o GPS.o Hosts.o Log.o Network.o Reflectors.o StopWatch.o Sync.o TCPSocket.o Thread.o Timer.o \