/usr/include/juce/modules/juce_opengl/ is in libjuce-dev 4.3.0~repack-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/juce/modules/juce_opengl/geometry/
/usr/include/juce/modules/juce_opengl/geometry/juce_Draggable3DOrientation.h
/usr/include/juce/modules/juce_opengl/geometry/juce_Matrix3D.h
/usr/include/juce/modules/juce_opengl/geometry/juce_Quaternion.h
/usr/include/juce/modules/juce_opengl/geometry/juce_Vector3D.h
/usr/include/juce/modules/juce_opengl/juce_opengl.h
/usr/include/juce/modules/juce_opengl/native/
/usr/include/juce/modules/juce_opengl/native/juce_MissingGLDefinitions.h
/usr/include/juce/modules/juce_opengl/native/juce_OpenGLExtensions.h
/usr/include/juce/modules/juce_opengl/native/juce_OpenGL_android.h
/usr/include/juce/modules/juce_opengl/native/juce_OpenGL_ios.h
/usr/include/juce/modules/juce_opengl/native/juce_OpenGL_linux.h
/usr/include/juce/modules/juce_opengl/native/juce_OpenGL_osx.h
/usr/include/juce/modules/juce_opengl/native/juce_OpenGL_win32.h
/usr/include/juce/modules/juce_opengl/opengl/
/usr/include/juce/modules/juce_opengl/opengl/juce_OpenGLContext.h
/usr/include/juce/modules/juce_opengl/opengl/juce_OpenGLFrameBuffer.h
/usr/include/juce/modules/juce_opengl/opengl/juce_OpenGLGraphicsContext.h
/usr/include/juce/modules/juce_opengl/opengl/juce_OpenGLHelpers.h
/usr/include/juce/modules/juce_opengl/opengl/juce_OpenGLImage.h
/usr/include/juce/modules/juce_opengl/opengl/juce_OpenGLPixelFormat.h
/usr/include/juce/modules/juce_opengl/opengl/juce_OpenGLRenderer.h
/usr/include/juce/modules/juce_opengl/opengl/juce_OpenGLShaderProgram.h
/usr/include/juce/modules/juce_opengl/opengl/juce_OpenGLTexture.h
/usr/include/juce/modules/juce_opengl/utils/
/usr/include/juce/modules/juce_opengl/utils/juce_OpenGLAppComponent.h