I have installed qt4.8 lib
How did you install the libs? On what platform? If you used your distro repository you might also need a "qt-devel" package.

On Windows the prebuilt-binary version of the Qt 4.8.2 libraries includes:
Qt Code: 
  1. D:\Qt\4.8.2>dir bin\*.exe /w
  2.  Volume in drive D is Data
  3.  Volume Serial Number is 9A47-6800
  4.  
  5.  Directory of D:\Qt\4.8.2\bin
  6.  
  7. assistant.exe              designer.exe
  8. dumpcpp.exe                idc.exe
  9. lconvert.exe               linguist.exe
  10. lrelease.exe               lupdate.exe
  11. moc.exe                    pixeltool.exe
  12. qcollectiongenerator.exe   qdoc3.exe
  13. qhelpconverter.exe         qhelpgenerator.exe
  14. qmake.exe                  qmlplugindump.exe
  15. qmlplugindumpd.exe         qmlviewer.exe
  16. qt3to4.exe                 qtdemo.exe
  17. qttracereplay.exe          rcc.exe
  18. uic.exe                    uic3.exe
  19. xmlpatterns.exe            xmlpatternsvalidator.exe
  20.               26 File(s)     17,203,712 bytes
  21.                0 Dir(s)  12,528,525,312 bytes free
To copy to clipboard, switch view to plain text mode