/usr/include/thrust/system/detail/internal/ is in libthrust-dev 1.6.0-1.
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..
/usr/include/thrust/system/detail/internal/decompose.h
/usr/include/thrust/system/detail/internal/scalar/
/usr/include/thrust/system/detail/internal/scalar/adjacent_difference.h
/usr/include/thrust/system/detail/internal/scalar/binary_search.h
/usr/include/thrust/system/detail/internal/scalar/copy.h
/usr/include/thrust/system/detail/internal/scalar/copy.inl
/usr/include/thrust/system/detail/internal/scalar/copy_backward.h
/usr/include/thrust/system/detail/internal/scalar/copy_if.h
/usr/include/thrust/system/detail/internal/scalar/extrema.h
/usr/include/thrust/system/detail/internal/scalar/find.h
/usr/include/thrust/system/detail/internal/scalar/for_each.h
/usr/include/thrust/system/detail/internal/scalar/general_copy.h
/usr/include/thrust/system/detail/internal/scalar/insertion_sort.h
/usr/include/thrust/system/detail/internal/scalar/merge.h
/usr/include/thrust/system/detail/internal/scalar/merge.inl
/usr/include/thrust/system/detail/internal/scalar/partition.h
/usr/include/thrust/system/detail/internal/scalar/reduce.h
/usr/include/thrust/system/detail/internal/scalar/reduce_by_key.h
/usr/include/thrust/system/detail/internal/scalar/remove.h
/usr/include/thrust/system/detail/internal/scalar/scan.h
/usr/include/thrust/system/detail/internal/scalar/scan_by_key.h
/usr/include/thrust/system/detail/internal/scalar/set_operations.h
/usr/include/thrust/system/detail/internal/scalar/sort.h
/usr/include/thrust/system/detail/internal/scalar/sort.inl
/usr/include/thrust/system/detail/internal/scalar/stable_merge_sort.h
/usr/include/thrust/system/detail/internal/scalar/stable_merge_sort.inl
/usr/include/thrust/system/detail/internal/scalar/stable_radix_sort.h
/usr/include/thrust/system/detail/internal/scalar/stable_radix_sort.inl
/usr/include/thrust/system/detail/internal/scalar/trivial_copy.h
/usr/include/thrust/system/detail/internal/scalar/unique.h
/usr/include/thrust/system/detail/internal/scalar/unique_by_key.h