Qt4 does not see the function in the dynamic library, although it includes the library itself?

Question

Qt

Compiled dynamic library libbozorth3. It defines the bozorth_main(xyt_struct*, xyt_struct*) function.
I checked it on the test source, compiled it using gcc, everything compiled, the function worked fine.
But when I connect the same library to Qt4 (in Qt Creator), then gcc sees it (otherwise it would swear that the library was not found), but does not see this function (although I just copied the code from the test source into my project ). What could be the problem and how to fix it? Why does the same gcc compile normally in the first case, but does not find the function together with qt4?

[email protected] ~/workspace/qt_fprint-build-desktop $ gcc -o qt_fprint main.o
mainwindow.o cfingerprintscanner.o cfingerprintdata.o moc_mainwindow.o moc_cfingerprintscanner.o
-lfprint -lQtGui -lQtCore -lpthread -lbozorth3cfingerprintscanner.o:
In function `CFingerprintScanner::comparePrintData(CFingerprintData,
CFingerprintData)':
/home/robotex/workspace/qt_fprint-build-desktop/../qt_fprint/cfingerprintscanner.cpp:475: undefined
reference to `bozorth_main(xyt_struct*, xyt_struct*)'
collect2: ld returned 1 exit status

Answer 1

Maybe when using qt4, libraries are somehow connected in a special way?