Getting undefined reference error

Question

I am including a header file gps.h in my main program and calling a function of header file included Gps_Pthread(). I tried adding and removing parameter of it.

below us the code for header file

#ifndef __GPS_H__
#define __GPS_H__

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <math.h>
#include <signal.h>
#include <termios.h>
#include <unistd.h>
#include <sys/ioctl.h>

#define u8 unsigned char
typedef struct {
    u8 UTCDateTime[6]; //YMDHMS
    char Status[20]; //A/V
    u8 Latitude[4]; //ddmm.mmmm
    char NS[20]; //N/S
    u8 Longitude[5]; //dddmm.mmmm
    char EW[20]; //E/W
    u8 Speed[3]; //speed000.0~999.9kts
    u8 Course[3]; //course000.0~359.9degree
} stru_GPSRMC;

typedef struct {
    char UTCTime[20]; //HMS
    char Status[20]; //A/V
    char Latitude[20]; //ddmm.mmmm
    char NS[20]; //N/S
    char Longitude[20]; //dddmm.mmmm
    char EW[20]; //E/W
    char Speed[20]; //speed000.0~999.9kts
    char Course[20]; //course000.0~359.9degree
    char UTCDate[20];//YMD

} strubf_GPSRMC;

typedef struct {
    char UTCTime[20]; //HMS
    char Latitude[20]; //ddmm.mmmm
    char NS[20]; //N/S
    char Longitude[20]; //dddmm.mmmm
    char EW[20]; //E/W
    char PositionFix[20];
    char SatUsed[20];
} strubf_GPSGGA;

typedef struct {
    u8 UTCTime[3];    //hhmmss.mmm
    u8 Latitude[4];    //ddmm.mmmm
    char NS[20];        //N/S
    u8 Longitude[5];    //dddmm.mmmm
    char EW[20];        //E/W
    u8 PositionFix;    //0,1,2,6
    u8 SatUsed;    //00~12
//    u8 HDOP[4];        //0.5~99.9
    //   u8 Altitude[7];    //-9999.9~99999.9
} stru_GPSGGA;

typedef struct {
    u8 Mode;        //A/M
    u8 Mode2;    //0,1,2,3
    u8 SatUsedList[12];
    u8 PDOP[4];
    u8 HDOP[4];
    u8 VDOP[4];
} stru_GPSGSA;

typedef struct {
    u8 SatID;
//    u8 Elevation[2];//0-90 degree
//    u8 Azimuth[3]; //0-359 degree
    u8 SNR; //0-99 dbHz
} stru_SatInfo;

typedef struct {
    u8 SatInView;
    stru_SatInfo SatInfo[12];
} stru_GPSGSV;

#define NMEA_NULL    0x00            //GPS statement type
#define NMEA_GPGGA    0x01
#define NMEA_GPGSA    0x02
#define NMEA_GPGSV    0x04
#define NMEA_GPRMC    0x08

extern stru_GPSRMC GPS_RMC_Data;
extern stru_GPSGGA GPS_GGA_Data;
extern stru_GPSGSA GPS_GSA_Data;
extern stru_GPSGSV GPS_GSV_Data;
extern strubf_GPSRMC GPSBF_RMC_DATA;
extern strubf_GPSGGA GPSBF_GGA_DATA;
extern unsigned char buffer0[200];


void ShowGPSTime(void);

void ParserGPGGA(void);

void ParserGPRMC(void);

extern void *Gps_Pthread(void *args);

extern void *sendGps_Pthread(void *args);

#endif

when sending parameter in function sendGps_Pthread() I get

undefined reference to `Gps_Pthread'

and when i call it without parameter then the error is

too few arguments to function 'Gps_Pthread'

How do i call that function to initialise the gps and get location?

Thanks in advance.