Ooops, correct is:
#declare hair_tex_aniso =

  texture{

ent{  
     shader{
       shader_file "aniso.slp"
      "xroughness" 0.1
      "yroughness" 0.7
       "brush_direction" <0,0.5,0>
       "Kd" 1 
       "Ka" 1  
       "Ks" 1.4
       "Cs" hair_color
}}
finish{ambient 0.2 diffuse 0.32}
normal {bozo 0.2 scale hair_scale}
}

#declare hair_tex_standard =
texture{
    pigment{
      hair_color}
finish{ambient 0.2 diffuse 0.6 specular 0.4 roughness 1/100 metallic 1}

}
#declare hair_texture = texture { bozo scale hair_scale
texture_map {[0 hair_tex_aniso]
             [0.3 hair_tex_aniso]
             [0.6 hair_tex_standard]
             [1 hair_tex_standard]}warp { reset_children}}

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