less_add_surface(lambertian)
less_add_surface(rpv)
less_add_surface(diffuse_transmitter)
less_add_surface(water)
less_add_surface(surface_fluorescence INTERFACE emission)
less_add_surface(thermal_surface INTERFACE emission)
less_add_surface(dielectric_water_boundary INTERFACE boundary)
less_add_surface(microwave FAMILY microwave SOURCES
    soil.h
    trunk_ground.h
    mie_cylinder.h)
