butterfly-2.0-arduino-error-output

Arduino: 1.6.7 (Mac OS X), Board: "Arduino Pro or Pro Mini, ATmega328 (5V, 16 MHz)"

/Users/user/Downloads/Butterfly2.0_開源資料/程式碼/MultiWii_x4_mpu6050_last_bluetooth/Serial.ino:155:0: warning: "GPS_COND" redefined [enabled by default]
         #define GPS_COND  && (GPS_SERIAL != CURRENTPORT)
 ^
/Users/user/Downloads/Butterfly2.0_開源資料/程式碼/MultiWii_x4_mpu6050_last_bluetooth/Serial.ino:150:0: note: this is the location of the previous definition
     #define GPS_COND
 ^
/Users/user/Downloads/Butterfly2.0_開源資料/程式碼/MultiWii_x4_mpu6050_last_bluetooth/Serial.ino: In function 'void setup()':
Serial:694: error: 'SerialOpen' was not declared in this scope
            #endif
                                   ^
Serial:753: error: 'SerialEnd' was not declared in this scope
 }
                           ^
/Users/user/Downloads/Butterfly2.0_開源資料/程式碼/MultiWii_x4_mpu6050_last_bluetooth/GPS.ino: In function 'void GPS_SerialInit()':
GPS:240: error: 'SerialOpen' was not declared in this scope
     SerialOpen(GPS_SERIAL,GPS_BAUD);  
                                   ^
/Users/user/Downloads/Butterfly2.0_開源資料/程式碼/MultiWii_x4_mpu6050_last_bluetooth/Sensors.ino: In function 'void initSensors()':
Sensors:1716: error: 'Baro_init' was not declared in this scope
   if (BARO) Baro_init();
                       ^
Sensors:1717: error: 'Mag_init' was not declared in this scope
   if (MAG) Mag_init();
                     ^
exit status 1
'SerialOpen' was not declared in this scope

  This report would have more information with
  "Show verbose output during compilation"
  enabled in File > Preferences.