i have downloaded QTSerialPortTerminal fro this link and open it with qt creator but i got 2 errors.

this is the output of compiler
Qt Code: 
  1. Running build steps for project QSerialPortTerminal...
  2. Configuration unchanged, skipping qmake step.
  3. Starting: "/usr/bin/make" -w
  4. make: Entering directory `/home/mtsaw/Downloads/77764-QTSerialPort 03-10-08'
  5. /opt/QtSDK/Desktop/Qt/474/gcc/bin/qmake -spec /opt/QtSDK/Desktop/Qt/474/gcc/mkspecs/linux-g++-32 -o Makefile QSerialPortTerminal.pro
  6. make: Leaving directory `/home/mtsaw/Downloads/77764-QTSerialPort 03-10-08'
  7. make: Entering directory `/home/mtsaw/Downloads/77764-QTSerialPort 03-10-08'
  8. g++ -m32 -Wl,-rpath,/opt/QtSDK/Desktop/Qt/474/gcc/lib -o QSerialPortTerminal build/.o/unix/main.o build/.o/unix/QSerialPortTerminal.o build/.o/unix/qextserialbase.o build/.o/unix/qextserialport.o build/.o/unix/ManageSerialPort.o build/.o/unix/posix_qextserialport.o build/.o/unix/moc_QSerialPortTerminal.o build/.o/unix/moc_ManageSerialPort.o    -L/usr/X11R6/lib -L/opt/QtSDK/Desktop/Qt/474/gcc/lib lib/libqserialdevice -lpthread -lQtGui -lQtCore -lXext -lX11 -lm
  9. /usr/bin/ld: cannot find -lXext
  10. /usr/bin/ld: cannot find -lX11
  11. make: Leaving directory `/home/mtsaw/Downloads/77764-QTSerialPort 03-10-08'
  12. collect2: ld returned 1 exit status
  13. make: *** [QSerialPortTerminal] Error 1
  14. The process "/usr/bin/make" exited with code 2.
  15. Error while building project QSerialPortTerminal (target: Desktop)
  16. When executing build step 'Make'
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