GL POINT_SIZE doesn't works in BUILD on Linux Unity Editor 5.4.3f1. Works only in Editor

I'm working on a Kinect DepthMap and PointClouds project based on Freenect libs on Ubuntu 16.04 LTS and Linux Unity Editor 5.4.3f1.

Here you can find my work in progress repository about depth: https://bitbucket.org/robertofazio/kinect-on-unity3d-linux-editor-5.3 )

I did a VertexColor Shaders that works fine both in Editor and in Build x86_64

 Shader "Custom/VertexColor" {
  
     Properties{
         minVertSize ("MinVertSize", Float) = 3.0
         maxVertSize ("MaxVertSize", Float) = 5.0
         colorDepth ("ColorDepth", Float) = 300.0
         minColor ("MinColor", Vector) = (0,0,1)
         maxColor ("MaxColor", Vector) = (1,0,0)
     }
     
     SubShader {
     Pass {
         LOD 200
          
         CGPROGRAM
         #pragma vertex vert
         #pragma fragment frag
          
          float minVertSize;
          float maxVertSize;
          float colorDepth;
          float3 minColor;
          float3 maxColor;
  
         struct VertexInput {
             float4 v : POSITION;
             float4 color: COLOR;
         };
          
         struct VertexOutput {
             float4 pos : SV_POSITION;
             float4 col : COLOR;
             float size : PSIZE0;
         };
          
         VertexOutput vert(VertexInput v) {
          
             VertexOutput o;
             o.pos = mul(UNITY_MATRIX_MVP, v.v);
             float pct = v.v[2]/colorDepth;
             o.col[0] = lerp(minColor[0],maxColor[0],pct);
             o.col[1] = lerp(minColor[1],maxColor[1],pct);;
             o.col[2] = lerp(minColor[2],maxColor[2],pct);;
             o.size = lerp(minVertSize,maxVertSize,pct);
                          
             return o;
         }
          
         float4 frag(VertexOutput o) : COLOR {
             return o.col;
         }
  
         ENDCG
         } 
     }
  
 }
 

I put also a EnablePointSizeScript.cs attached to the Camera:

 #if UNITY_STANDALONE_LINUX || UNITY_EDITOR_LINUX || UNITY_STANDALONE || UNITY_STANDALONE_LINUX_API
 #define IMPORT_GLENABLE
 #endif
 
 //"/usr/lib/nvidia-361/libGL.so";
 using UnityEngine;
 using System;
 using System.Collections;
 using System.Runtime.InteropServices;
 
 public class EnablePointSize : MonoBehaviour 
 {
     const UInt32 GL_VERTEX_PROGRAM_POINT_SIZE = 0x8642;
     const UInt32 GL_POINT_SMOOTH = 0x0B10;
     //        "/usr/lib/x86_64-linux-gnu/mesa/libGL.so";  

     const string LibGLPath =
         
         #if UNITY_EDITOR_LINUX
         "/usr/lib/x86_64-linux-gnu/mesa/libGL.so" ;// Untested on Linux, this may not be correct
         #elif UNITY_STANDALONE_LINUX
         "/usr/lib/x86_64-linux-gnu/mesa/libGL.so" ;// Untested on Linux, this may not be correct
         #elif UNITY_STANDALONE_WIN
         "opengl32.dll";
         #elif UNITY_STANDALONE_OSX || UNITY_EDITOR_OSX
         "/System/Library/Frameworks/OpenGL.framework/OpenGL";
 
         #else
         null;   // OpenGL ES platforms don't require this feature
         #endif
 
 
     
         #if IMPORT_GLENABLE
         [DllImport(LibGLPath)]
     public static extern void glEnable(UInt32 cap);
 
     private bool mIsOpenGL;
     private bool first;
 
     void Start()
     {
 
         mIsOpenGL = SystemInfo.graphicsDeviceVersion.Contains("OpenGL");
         first = true;
 
         #if UNITY_EDITOR_LINUX
         Debug.LogError("unity editor");
         #elif UNITY_STANDALONE_LINUX
         Debug.LogError ("unity standalone linux");
         #endif
 
     }
 
     void OnPreRender()
     {
         if (first)
         {
             if (mIsOpenGL)
                 glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
             first = false;
             Debug.LogError (mIsOpenGL);
             glEnable(GL_POINT_SMOOTH);
         }
 
 
     }
         #endif
 }

Everything works in Editor: I mean I'm able to modify at runtime the GL_VERTEX_PROGRAM_POINT_SIZE and VertexColor

When I build on Ubuntu Linux, GL POINT SIZE doesn't work and VertexColor Shaders works.

I've tried both OpenGL2 and OpenGLCore. I used both Intel and Amd CPU with a GTX 550 GPU. In the next days I'm going to test on a GTX1070. Finally I also switched to Mesa libGL path "/usr/lib/x86_64-linux-gnu/mesa/libGL.so" and NVIDIA path "/usr/lib/nvidia-361/libGL.so" but I get the same issue, points are always very thin.

Same project works in in OSX Unity Editor and Standalone OSX