/usr/ is in libclsparse-dev 0.10.2.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/clSPARSE-1x.h
/usr/include/clSPARSE-2x.h
/usr/include/clSPARSE-error.h
/usr/include/clSPARSE-version.h
/usr/include/clSPARSE-xx.h
/usr/include/clSPARSE.h
/usr/include/clsparse_export.h
/usr/include/clsparsetimer_export.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/clSPARSE/
/usr/lib/x86_64-linux-gnu/cmake/clSPARSE/clSPARSE-Targets-none.cmake
/usr/lib/x86_64-linux-gnu/cmake/clSPARSE/clSPARSE-Targets.cmake
/usr/lib/x86_64-linux-gnu/cmake/clSPARSE/clSPARSEConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/clSPARSE/clSPARSEConfigVersion.cmake
/usr/share/
/usr/share/doc/
/usr/share/doc/libclsparse-dev/
/usr/share/doc/libclsparse-dev/copyright
/usr/lib/x86_64-linux-gnu/libclSPARSE.so
/usr/lib/x86_64-linux-gnu/libclsparseTimer.so
/usr/share/doc/libclsparse-dev/changelog.Debian.gz