PixelGL backend uses OpenGL to render
graphics. Because of that, OpenGL development libraries are needed for compilation. The dependencies
are same as for GLFW.
On macOS, you need Xcode or Command Line Tools for Xcode (xcode-select --install) for required
headers and libraries.
On Ubuntu/Debian-like Linux distributions, you need libgl1-mesa-dev and xorg-dev packages.
On CentOS/Fedora-like Linux distributions, you need libX11-devel libXcursor-devel libXrandr-devel libXinerama-devel mesa-libGL-devel libXi-devel packages.