yes that would do it. best thing is to check the makefiles that the .pro file generates and see if its installing your app into /opt. the icons stay in /usr/share itself as u configured AFAIK
QT += phonon TARGET = countdowntimer TEMPLATE = app SOURCES += qtmain.cpp \ settings.cpp \ form.cpp HEADERS += settings.h \ form.h FORMS += settings.ui \ form.ui PREFIX = ../debian/countdowntimer/usr unix { BINDIR = $$PREFIX/opt DATADIR =$$PREFIX/opt DEFINES += DATADIR=\"$$DATADIR\" PKGDATADIR=\"$$PKGDATADIR\" #MAKE INSTALL INSTALLS += target desktop icon64 target.path =$$BINDIR desktop.path = $$DATADIR/applications/hildon desktop.files += countdowntimer.desktop icon64.path = $$DATADIR/icons/hicolor/64x64/apps icon64.files += ../data/64x64/countdowntimer.png }