/usr/include/x86_64-linux-gnu/ is in libsolvext0-dev 0.6.11-1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/x86_64-linux-gnu/solv/
/usr/include/x86_64-linux-gnu/solv/pool_fileconflicts.h
/usr/include/x86_64-linux-gnu/solv/repo_arch.h
/usr/include/x86_64-linux-gnu/solv/repo_autopattern.h
/usr/include/x86_64-linux-gnu/solv/repo_content.h
/usr/include/x86_64-linux-gnu/solv/repo_cudf.h
/usr/include/x86_64-linux-gnu/solv/repo_deb.h
/usr/include/x86_64-linux-gnu/solv/repo_deltainfoxml.h
/usr/include/x86_64-linux-gnu/solv/repo_helix.h
/usr/include/x86_64-linux-gnu/solv/repo_mdk.h
/usr/include/x86_64-linux-gnu/solv/repo_products.h
/usr/include/x86_64-linux-gnu/solv/repo_pubkey.h
/usr/include/x86_64-linux-gnu/solv/repo_releasefile_products.h
/usr/include/x86_64-linux-gnu/solv/repo_repomdxml.h
/usr/include/x86_64-linux-gnu/solv/repo_rpmdb.h
/usr/include/x86_64-linux-gnu/solv/repo_rpmmd.h
/usr/include/x86_64-linux-gnu/solv/repo_solv.h
/usr/include/x86_64-linux-gnu/solv/repo_susetags.h
/usr/include/x86_64-linux-gnu/solv/repo_updateinfoxml.h
/usr/include/x86_64-linux-gnu/solv/repo_write.h
/usr/include/x86_64-linux-gnu/solv/repo_zyppdb.h
/usr/include/x86_64-linux-gnu/solv/solv_pgpvrfy.h
/usr/include/x86_64-linux-gnu/solv/solv_xfopen.h
/usr/include/x86_64-linux-gnu/solv/tools_util.h