/usr/ is in libqca2-dev 2.0.3-5.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/qca2.pc
/usr/lib/x86_64-linux-gnu/libqca.prl
/usr/share/
/usr/share/doc/
/usr/share/doc/libqca2-dev/
/usr/share/doc/libqca2-dev/copyright
/usr/share/qt4/
/usr/share/qt4/mkspecs/
/usr/share/qt4/mkspecs/features/
/usr/share/qt4/mkspecs/features/crypto.prf
/usr/include/
/usr/include/QtCrypto/
/usr/include/QtCrypto/qca_basic.h
/usr/include/QtCrypto/qcaprovider.h
/usr/include/QtCrypto/QtCrypto
/usr/include/QtCrypto/qca_securemessage.h
/usr/include/QtCrypto/qca_core.h
/usr/include/QtCrypto/qca_textfilter.h
/usr/include/QtCrypto/qca_tools.h
/usr/include/QtCrypto/qca_cert.h
/usr/include/QtCrypto/qca.h
/usr/include/QtCrypto/qca_export.h
/usr/include/QtCrypto/qca_securelayer.h
/usr/include/QtCrypto/qca_support.h
/usr/include/QtCrypto/qca_keystore.h
/usr/include/QtCrypto/qpipe.h
/usr/include/QtCrypto/qca_publickey.h
/usr/lib/x86_64-linux-gnu/libqca.so
/usr/share/doc/libqca2-dev/changelog.Debian.gz