/usr/include/thrust/system/detail/sequential/ is in libthrust-dev 1.8.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/thrust/system/detail/sequential/adjacent_difference.h
/usr/include/thrust/system/detail/sequential/assign_value.h
/usr/include/thrust/system/detail/sequential/binary_search.h
/usr/include/thrust/system/detail/sequential/copy.h
/usr/include/thrust/system/detail/sequential/copy.inl
/usr/include/thrust/system/detail/sequential/copy_backward.h
/usr/include/thrust/system/detail/sequential/copy_if.h
/usr/include/thrust/system/detail/sequential/count.h
/usr/include/thrust/system/detail/sequential/equal.h
/usr/include/thrust/system/detail/sequential/execution_policy.h
/usr/include/thrust/system/detail/sequential/extrema.h
/usr/include/thrust/system/detail/sequential/fill.h
/usr/include/thrust/system/detail/sequential/find.h
/usr/include/thrust/system/detail/sequential/for_each.h
/usr/include/thrust/system/detail/sequential/gather.h
/usr/include/thrust/system/detail/sequential/general_copy.h
/usr/include/thrust/system/detail/sequential/generate.h
/usr/include/thrust/system/detail/sequential/get_value.h
/usr/include/thrust/system/detail/sequential/inner_product.h
/usr/include/thrust/system/detail/sequential/insertion_sort.h
/usr/include/thrust/system/detail/sequential/iter_swap.h
/usr/include/thrust/system/detail/sequential/logical.h
/usr/include/thrust/system/detail/sequential/malloc_and_free.h
/usr/include/thrust/system/detail/sequential/merge.h
/usr/include/thrust/system/detail/sequential/merge.inl
/usr/include/thrust/system/detail/sequential/mismatch.h
/usr/include/thrust/system/detail/sequential/partition.h
/usr/include/thrust/system/detail/sequential/reduce.h
/usr/include/thrust/system/detail/sequential/reduce_by_key.h
/usr/include/thrust/system/detail/sequential/remove.h
/usr/include/thrust/system/detail/sequential/replace.h
/usr/include/thrust/system/detail/sequential/reverse.h
/usr/include/thrust/system/detail/sequential/scan.h
/usr/include/thrust/system/detail/sequential/scan_by_key.h
/usr/include/thrust/system/detail/sequential/scatter.h
/usr/include/thrust/system/detail/sequential/sequence.h
/usr/include/thrust/system/detail/sequential/set_operations.h
/usr/include/thrust/system/detail/sequential/sort.h
/usr/include/thrust/system/detail/sequential/sort.inl
/usr/include/thrust/system/detail/sequential/stable_merge_sort.h
/usr/include/thrust/system/detail/sequential/stable_merge_sort.inl
/usr/include/thrust/system/detail/sequential/stable_primitive_sort.h
/usr/include/thrust/system/detail/sequential/stable_primitive_sort.inl
/usr/include/thrust/system/detail/sequential/stable_radix_sort.h
/usr/include/thrust/system/detail/sequential/stable_radix_sort.inl
/usr/include/thrust/system/detail/sequential/swap_ranges.h
/usr/include/thrust/system/detail/sequential/tabulate.h
/usr/include/thrust/system/detail/sequential/temporary_buffer.h
/usr/include/thrust/system/detail/sequential/transform.h
/usr/include/thrust/system/detail/sequential/transform_reduce.h
/usr/include/thrust/system/detail/sequential/transform_scan.h
/usr/include/thrust/system/detail/sequential/trivial_copy.h
/usr/include/thrust/system/detail/sequential/uninitialized_copy.h
/usr/include/thrust/system/detail/sequential/uninitialized_fill.h
/usr/include/thrust/system/detail/sequential/unique.h
/usr/include/thrust/system/detail/sequential/unique_by_key.h