/usr/ is in libostree-dev 2018.4-2.
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/usr/include/
/usr/include/ostree-1/
/usr/include/ostree-1/ostree-async-progress.h
/usr/include/ostree-1/ostree-autocleanups.h
/usr/include/ostree-1/ostree-bootconfig-parser.h
/usr/include/ostree-1/ostree-core.h
/usr/include/ostree-1/ostree-deployment.h
/usr/include/ostree-1/ostree-diff.h
/usr/include/ostree-1/ostree-dummy-enumtypes.h
/usr/include/ostree-1/ostree-gpg-verify-result.h
/usr/include/ostree-1/ostree-mutable-tree.h
/usr/lib/x86_64-linux-gnu/libostree-1.so
/usr/include/ostree-1/ostree-repo-deprecated.h
/usr/include/ostree-1/ostree-repo-file.h
/usr/include/ostree-1/ostree-repo.h
/usr/include/ostree-1/ostree-sepolicy.h
/usr/include/ostree-1/ostree-sysroot-upgrader.h
/usr/include/ostree-1/ostree-sysroot.h
/usr/include/ostree-1/ostree-types.h
/usr/include/ostree-1/ostree-version.h
/usr/include/ostree-1/ostree.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/ostree-1.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libostree-dev/
/usr/share/doc/libostree-dev/copyright
/usr/share/gir-1.0/
/usr/share/gir-1.0/OSTree-1.0.gir
/usr/share/doc/libostree-dev/changelog.Debian.gz