Mfix-21.4 & RHEL 7.5 with X11 starts and fails to open GLEW could not be initialized: Missing GL version

OK where to start then?

xclock and xterm start just fine as well.

glxgears
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast
X Error of failed request:  BadAlloc (insufficient resources for operation)
  Major opcode of failed request:  149 (GLX)
  Minor opcode of failed request:  3 (X_GLXCreateContext)
  Serial number of failed request:  30
  Current serial number in output stream:  32
vglrun glxgears
[VGL] NOTICE: Automatically setting VGL_CLIENT environment variable to
[VGL]    x.x.x.x, the IP address of your SSH client.
[VGL] ERROR: Could not open display :0.

Are there any environment variables we can set that might be missed? Or modules to load?