Installing rgl on Ubuntu and Mac: X11 not found

Question

I have seen this question here: Error in loading rgl package with Mac OS X but there is no mentioning about installation error, which is my case. I cannot install rgl<

Answer 1

Took me a long time to figure this out on the [RHEL 3.10.0-862.14.4.el7.x86_64 x86_64 x86_64 x86_64 GNU/Linux]. The following packages are required:

libpng12-devel.x86_64
ImageMagick-c++-devel.x86_64
mesa-libGLU-devel.x86_64
libselinux-devel.x86_64
xorg-x11-apps