Consider this .pro file:

// .... contents before this be ignored

win32:
{
LIBS += C:\Qt\qtcreator-master-qml\Test\qtflickr\lib\libqtflickr0.a
}

symbian:
{
TARGET.CAPABILITY = NetworkServices # Symbian specific, we just need network access

LIBS += -lqtflickr
LIBS += -lcone -leikcore -lavkon

qtflickr.sources = qtflickr.dll
qtflickr.path = \sys\bin
DEPLOYMENT += qtflickr
}

// file ends

now if i build the pro file for desktop i get this error:

c:/qt/qtcreator-1.3.83/mingw/bin/../lib/gcc/mingw32/4.4.0/../../../../mingw32/bin/ld.exe: cannot find -lqtflickr
collect2: ld returned 1 exit status
mingw32-make[1]: *** [qtflickr/lib/Test.exe] Error 1
mingw32-make: *** [debug] Error 2
Exited with code 2.
Error while building project Test (target: Desktop)
When executing build step 'Make'