/usr/include/qt5/QtSerialPort/QtSerialPortDepends is in libqt5serialport5-dev 5.2.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | /* This file was generated by qmake with the info from <root>/src/serialport/serialport.pro. */
#include <QtCore/QtCore>
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