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:
D:\Qt\4.8.2>dir bin\*.exe /w
Volume in drive D is Data
Volume Serial Number is 9A47-6800
Directory of D:\Qt\4.8.2\bin
assistant.exe designer.exe
dumpcpp.exe idc.exe
lconvert.exe linguist.exe
lrelease.exe lupdate.exe
moc.exe pixeltool.exe
qcollectiongenerator.exe qdoc3.exe
qhelpconverter.exe qhelpgenerator.exe
qmake.exe qmlplugindump.exe
qmlplugindumpd.exe qmlviewer.exe
qt3to4.exe qtdemo.exe
qttracereplay.exe rcc.exe
uic.exe uic3.exe
xmlpatterns.exe xmlpatternsvalidator.exe
26 File(s) 17,203,712 bytes
0 Dir(s) 12,528,525,312 bytes free
D:\Qt\4.8.2>dir bin\*.exe /w
Volume in drive D is Data
Volume Serial Number is 9A47-6800
Directory of D:\Qt\4.8.2\bin
assistant.exe designer.exe
dumpcpp.exe idc.exe
lconvert.exe linguist.exe
lrelease.exe lupdate.exe
moc.exe pixeltool.exe
qcollectiongenerator.exe qdoc3.exe
qhelpconverter.exe qhelpgenerator.exe
qmake.exe qmlplugindump.exe
qmlplugindumpd.exe qmlviewer.exe
qt3to4.exe qtdemo.exe
qttracereplay.exe rcc.exe
uic.exe uic3.exe
xmlpatterns.exe xmlpatternsvalidator.exe
26 File(s) 17,203,712 bytes
0 Dir(s) 12,528,525,312 bytes free
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