$ dpkg -L libsoil-dev |grep include /usr/include /usr/include/SOIL /usr/include/SOIL/SOIL.h /usr/include/SOIL/image_DXT.h /usr/include/SOIL/image_helper.h /usr/include/SOIL/stbi_DDS_aug.h /usr/include/SOIL/stbi_DDS_aug_c.h /usr/include/SOIL/stb_image_aug.h
So, you probably want the following on the g ++ command line
-I /usr/include/SOIL
Or just use the following in your C ++
#include <SOIL/SOIL.h>
And you probably need the following on the command line when binding
-lSOIL
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