/usr/ is in libxinerama-dev 2:1.1.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/X11/
/usr/include/X11/extensions/
/usr/include/X11/extensions/panoramiXext.h
/usr/include/X11/extensions/Xinerama.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/libXinerama.a
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/xinerama.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libxinerama-dev/
/usr/share/doc/libxinerama-dev/copyright
/usr/share/man/
/usr/share/man/man3/
/usr/share/man/man3/Xinerama.3.gz
/usr/lib/x86_64-linux-gnu/libXinerama.so
/usr/share/doc/libxinerama-dev/changelog.Debian.gz
/usr/share/man/man3/XineramaQueryExtension.3.gz
/usr/share/man/man3/XineramaIsActive.3.gz
/usr/share/man/man3/XineramaQueryScreens.3.gz
/usr/share/man/man3/XineramaQueryVersion.3.gz