/usr/share/qt5/mkspecs/features/qofono-qt5.prf is in libqofono-dev 0.82+16.04.20160127-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | prefix=/usr
exec_prefix=$${prefix}
DEPENDPATH += $${prefix}/include/qofono-qt5
INCLUDEPATH += $${prefix}/include/qofono-qt5
LIBS += -L $${exec_prefix}/lib -lqofono-qt5
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