/usr/lib/ is in libqt4-dev 4:4.8.7+dfsg-5ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/libQtCLucene.prl
/usr/lib/x86_64-linux-gnu/libQtSvg.prl
/usr/lib/x86_64-linux-gnu/libQtUiTools.a
/usr/lib/x86_64-linux-gnu/libQtScript.prl
/usr/lib/x86_64-linux-gnu/libQtUiTools.prl
/usr/lib/x86_64-linux-gnu/libQtSql.prl
/usr/lib/x86_64-linux-gnu/libQtGui.prl
/usr/lib/x86_64-linux-gnu/pkgconfig/
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/usr/lib/x86_64-linux-gnu/pkgconfig/QtSql.pc
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/usr/lib/x86_64-linux-gnu/pkgconfig/QtTest.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/QtNetwork.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/QtDBus.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/QtSvg.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/QtScript.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/QtCore.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/QtDesignerComponents.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/QtUiTools.pc
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/usr/lib/x86_64-linux-gnu/libQtNetwork.prl
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