destroy Subroutine

    elemental subroutine destroy(this)
        class(metapackage_t), intent(inout) :: this
        this%has_link_libraries = .false.
        this%has_link_flags = .false.
        this%has_build_flags = .false.
        this%has_fortran_flags = .false.
        this%has_c_flags = .false.
        this%has_cxx_flags = .false.
        this%has_include_dirs = .false.
        this%has_dependencies = .false.
        this%has_run_command = .false.
        this%has_external_modules = .false.
        if (allocated(this%version)) deallocate(this%version)
        if (allocated(this%flags%s)) deallocate(this%flags%s)
        if (allocated(this%link_libs)) deallocate(this%link_libs)
        if (allocated(this%incl_dirs)) deallocate(this%incl_dirs)
        if (allocated(this%external_modules)) deallocate(this%external_modules)
    end subroutine destroy