/usr/include/d/ is in libvibe-utils-dev 0.8.2-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/d/vibe/
/usr/include/d/vibe/vibe/
/usr/include/d/vibe/vibe/internal/
/usr/include/d/vibe/vibe/internal/allocator.d
/usr/include/d/vibe/vibe/internal/freelistref.d
/usr/include/d/vibe/vibe/internal/interfaceproxy.d
/usr/include/d/vibe/vibe/internal/memory.d
/usr/include/d/vibe/vibe/internal/memory_legacy.d
/usr/include/d/vibe/vibe/internal/meta/
/usr/include/d/vibe/vibe/internal/meta/all.d
/usr/include/d/vibe/vibe/internal/meta/codegen.d
/usr/include/d/vibe/vibe/internal/meta/funcattr.d
/usr/include/d/vibe/vibe/internal/meta/traits.d
/usr/include/d/vibe/vibe/internal/meta/typetuple.d
/usr/include/d/vibe/vibe/internal/meta/uda.d
/usr/include/d/vibe/vibe/internal/rangeutil.d
/usr/include/d/vibe/vibe/internal/utilallocator.d
/usr/include/d/vibe/vibe/internal/win32.d
/usr/include/d/vibe/vibe/utils/
/usr/include/d/vibe/vibe/utils/array.d
/usr/include/d/vibe/vibe/utils/dictionarylist.d
/usr/include/d/vibe/vibe/utils/hashmap.d
/usr/include/d/vibe/vibe/utils/memory.d
/usr/include/d/vibe/vibe/utils/string.d
/usr/include/d/vibe/vibe/utils/validation.d