pkg_config Requires: field is missing QT Version, rendering it unusable.

If you compile Qt from source, the 'Requires:' field in the pkg_config files (.pc) is lacking the Qt version:

lib/pkgconfig$ grep -E "Requires:.*Qt" *
Qt5CLucene.pc:Requires: QtCore
Qt5Designer.pc:Requires: QtXml
Qt5DesignerComponents.pc:Requires: QtCore QtDesigner QtGui QtXml
Qt5Help.pc:Requires: QtGui QtWidgets
Qt5Multimedia.pc:Requires: QtNetwork QtGui
Qt5MultimediaQuick_p.pc:Requires: QtCore QtQuick
Qt5MultimediaWidgets.pc:Requires: QtCore QtGui
Qt5Qml.pc:Requires: QtNetwork
Qt5QmlDevTools.pc:Requires: QtCore
Qt5QuickTest.pc:Requires: QtCore
Qt5UiTools.pc:Requires: QtCore
Qt5WebKit.pc:Requires: QtCore QtGui QtNetwork QtWidgets QtCore QtGui QtNetwork
Qt5WebKitWidgets.pc:Requires: QtCore QtGui QtNetwork QtWidgets
Qt5XmlPatterns.pc:Requires: QtNetwork

Should be Qt5Network instead of QtNetwork, note the missing 5 (MAJOR_VERSION).

This is generated in the file:
qtbase/mkspecs/features/qt_module.prf:208

https://qt.gitorious.org/qt/qtbase/blobs/stable/mkspecs/features/qt_module.prf#line209