/usr/lib/ is in libpyside-dev 1.2.2+source1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/PySide-1.2.2/
/usr/lib/x86_64-linux-gnu/cmake/PySide-1.2.2/PySideConfig-python2.7.cmake
/usr/lib/x86_64-linux-gnu/cmake/PySide-1.2.2/PySideConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/PySide-1.2.2/PySideConfig.cpython-36m-x86_64-linux-gnu.cmake
/usr/lib/x86_64-linux-gnu/cmake/PySide-1.2.2/PySideConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/pyside.pc
/usr/lib/x86_64-linux-gnu/libpyside-python2.7.so
/usr/lib/x86_64-linux-gnu/libpyside.cpython-36m-x86_64-linux-gnu.so
/usr/lib/x86_64-linux-gnu/libpyside.so
/usr/lib/x86_64-linux-gnu/libpyside1.2.so