Launchpad fails when you request package "gl" and says there's no such thing on ARM: https://launchpadlibrarian.net/148040543/buildlog_ubuntu-precise-armhf.pantheon-greeter_1.0.2-0~r207%2Bpkg22%2Br1~precise1_FAILEDTOBUILD.txt.gz
So I suspect Pantheon Greeter makes some direct GL calls bypassing Clutter abstraction layer.
Launchpad fails when you request package "gl" and says there's no such thing on ARM: https:/ /launchpadlibra rian.net/ 148040543/ buildlog_ ubuntu- precise- armhf.pantheon- greeter_ 1.0.2-0~ r207%2Bpkg22% 2Br1~precise1_ FAILEDTOBUILD. txt.gz
So I suspect Pantheon Greeter makes some direct GL calls bypassing Clutter abstraction layer.