Stuck trying to get unigine-heaven to run

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https://bbs.archlinux.org – I'd like to run benchmarks on a couple of graphics cards I have around, so I'm trying out unigine-heaven from the AUR. (Forgive me for asking for help with unsupported packages.) The initial window launches, but when I actually try to run the benchmark it fails with:$ unigine-valley Loading "/opt/unigine-valley/bin/../data/valley_1.0.cfg"...Loading "libGPUMonitor_x64.so"...Loading "libGL.so.1"...Loading "libopenal.so.1"...Set 1280x1024 fullscreen video modeX Error of failed request:  GLXBadFBConfig  Major opcode of failed request:&#16 (HowTos)