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/usr/include/liggghts/style_sph_kernel.h is in libliggghts-dev 2.3.8-1build1.

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#include "sph_kernel_cubicspline.h"
#include "sph_kernel_cubicspline2D.h"
#include "sph_kernel_spiky.h"
#include "sph_kernel_spiky2D.h"
#include "sph_kernel_wendland.h"
#include "sph_kernel_wendland2D.h"