OpenGLES Build Error with master branch VTK8.90
System: Ubuntu 18.04.03 GCC 7.4 cmake .. -DVTK_OPENGL_USE_GLES=ON
Error Reports:
[ 27%] Building CXX object Rendering/OpenGL2/CMakeFiles/RenderingOpenGL2.dir/vtkXOpenGLRenderWindow.cxx.o In file included from /usr/include/GL/glx.h:32:0, from /home/wjl/github/VTK/Rendering/OpenGL2/vtkXOpenGLRenderWindow.cxx:34: /usr/include/GL/gl.h:792:7: error: declaration does not declare anything [-fpermissive] GLAPI void GLAPIENTRY glDrawBuffer( GLenum mode ); ^~~~ Rendering/OpenGL2/CMakeFiles/RenderingOpenGL2.dir/build.make:1877: recipe for target 'Rendering/OpenGL2/CMakeFiles/RenderingOpenGL2.dir/vtkXOpenGLRenderWindow.cxx.o' failed
The normal OpenGL is compiled OK.