From 64b1331c23375e85f522b42cbd54314297a87824 Mon Sep 17 00:00:00 2001
From: Matthias Hochsteger <mhochsteger@cerbsim.com>
Date: Tue, 10 Dec 2019 11:57:11 +0100
Subject: [PATCH] Fix build errors on Macos

- Include opengl3 headers
- Remove unneeded Opengl4.5 function call
---
 libsrc/include/incopengl.hpp    | 3 ++-
 libsrc/visualization/mvdraw.cpp | 1 -
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libsrc/include/incopengl.hpp b/libsrc/include/incopengl.hpp
index d8c3bcea..c4630a09 100644
--- a/libsrc/include/incopengl.hpp
+++ b/libsrc/include/incopengl.hpp
@@ -6,7 +6,8 @@
 
 #  if defined(TOGL_AGL) || defined(TOGL_AGL_CLASSIC) || defined(TOGL_NSOPENGL)
 #define GL_SILENCE_DEPRECATION
-#    include <OpenGL/gl.h>
+#define GL_DO_NOT_WARN_IF_MULTI_GL_VERSION_HEADERS_INCLUDED
+#    include <OpenGL/gl3.h>
 #    include <OpenGL/glu.h>
 #  else
 #    include <GL/gl.h>
diff --git a/libsrc/visualization/mvdraw.cpp b/libsrc/visualization/mvdraw.cpp
index b9c5f4dc..6754b7de 100644
--- a/libsrc/visualization/mvdraw.cpp
+++ b/libsrc/visualization/mvdraw.cpp
@@ -827,7 +827,6 @@ namespace netgen
     std::vector<unsigned char> buffer(w*h*3);
     glPixelStorei(GL_UNPACK_ALIGNMENT,1);
     glPixelStorei(GL_PACK_ALIGNMENT,1);
-    glNamedFramebufferReadBuffer( fb, GL_COLOR_ATTACHMENT0 );
     glReadPixels (0, 0, w, h, GL_RGB, GL_UNSIGNED_BYTE, &buffer[0]);
 
     glDeleteRenderbuffers(1, &depthrenderbuffer);