§ libOpenGL, libVDSO and Nix

• openGL is bother userspace / user facing (provides APIs) and drivers (talks to GPU hardware)
• Nix thinks openGL is impure becuase openGL needs to be loaded based on target hardware , which is fundamentally unknown at host build machine .
• Contrast this situatino to VDSO, which is a library the kernel secretly links/loads into any executable to provide access to syscalls.
• This is also a fundamentally target side infra, which the host build cannot know about, but this impurity is "purified" for Nix because userspace doesn't need to worry about loading VDSO!
• If it were the case that the kernel also links in