Qt Libraries 4.8.4 for Mac installs in /usr/{bin,include/lib}

I installed the 4.8.4 Qt Libraries and debug libraries for Mac; they installed

/usr/bin/findtr
/usr/bin/findtr-4.8
/usr/bin/lconvert
/usr/bin/lconvert-4.8
/usr/bin/lrelease
/usr/bin/lrelease-4.8
/usr/bin/lupdate
/usr/bin/lupdate-4.8
/usr/bin/macdeployqt
/usr/bin/macdeployqt-4.8
/usr/bin/moc
/usr/bin/moc-4.8
/usr/bin/qcollectiongenerator
/usr/bin/qcollectiongenerator-4.8
/usr/bin/qdbus
/usr/bin/qdbus-4.8
/usr/bin/qdbuscpp2xml
/usr/bin/qdbuscpp2xml-4.8
/usr/bin/qdbusxml2cpp
/usr/bin/qdbusxml2cpp-4.8
/usr/bin/qdoc3
/usr/bin/qdoc3-4.8
/usr/bin/qhelpgenerator
/usr/bin/qhelpgenerator-4.8
/usr/bin/qmake
/usr/bin/qmake-4.8
/usr/bin/qt3to4
/usr/bin/qt3to4-4.8
/usr/bin/rcc
/usr/bin/rcc-4.8
/usr/bin/uic
/usr/bin/uic-4.8
/usr/bin/uic3
/usr/bin/uic3-4.8
/usr/bin/xmlpatterns
/usr/bin/xmlpatterns-4.8
/usr/include/QtUiTools
/usr/include/QtUiTools/QUiLoader
/usr/include/QtUiTools/QtUiTools
/usr/include/QtUiTools/quiloader.h
/usr/lib/libQtCLucene.4.8.4.dylib
/usr/lib/libQtCLucene.4.8.dylib
/usr/lib/libQtCLucene.4.dylib
/usr/lib/libQtCLucene.dylib
/usr/lib/libQtCLucene_debug.4.8.4.dylib
/usr/lib/libQtCLucene_debug.4.8.4.dylib.dSYM
/usr/lib/libQtCLucene_debug.4.8.4.dylib.dSYM/Contents
/usr/lib/libQtCLucene_debug.4.8.4.dylib.dSYM/Contents/Info.plist
/usr/lib/libQtCLucene_debug.4.8.4.dylib.dSYM/Contents/Resources
/usr/lib/libQtCLucene_debug.4.8.4.dylib.dSYM/Contents/Resources/DWARF
/usr/lib/libQtCLucene_debug.4.8.4.dylib.dSYM/Contents/Resources/DWARF/libQtCLucene_debug.4.8.4.dylib
/usr/lib/libQtCLucene_debug.4.8.dylib
/usr/lib/libQtCLucene_debug.4.dylib
/usr/lib/libQtCLucene_debug.dylib
/usr/lib/libQtUiTools.a
/usr/lib/libQtUiTools_debug.a

Just as /System/* are intended for software etc. shipped as part of the OS, /usr/

are intended for software etc. shipped as part of the OS. Qt tools, headers, libraries, etc. should be installed in, for example, subdirectories of /usr/local, or perhaps under /opt.