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$ WLR_BACKENDS=headless WLR_RENDERER=gles2 LD_LIBRARY_PATH=wayfire/build/subprojects/wlroots/ sway
libEGL warning: MESA-LOADER: failed to open vgem: /usr/lib/dri/vgem_dri.so: cannot open shared object file: No such file or directory (search paths /usr/lib/x86_64-linux-gnu/dri:\$${ORIGIN}/dri:/usr/lib/dri, suffix _dri)

00:00:00.003 [wlr] [EGL] command: eglInitialize, error: EGL_NOT_INITIALIZED (0x3001), message: "DRI2: failed to load driver"
libEGL warning: MESA-LOADER: failed to open vgem: /usr/lib/dri/vgem_dri.so: cannot open shared object file: No such file or directory (search paths /usr/lib/x86_64-linux-gnu/dri:\$${ORIGIN}/dri:/usr/lib/dri, suffix _dri)

00:00:00.003 [wlr] [EGL] command: eglInitialize, error: EGL_NOT_INITIALIZED (0x3001), message: "DRI2: failed to load driver"
libEGL warning: NEEDS EXTENSION: falling back to kms_swrast
MESA-LOADER: failed to open vgem: /usr/lib/dri/vgem_dri.so: cannot open shared object file: No such file or directory (search paths /usr/lib/x86_64-linux-gnu/dri:\$${ORIGIN}/dri:/usr/lib/dri, suffix _dri)
00:00:00.329 [wlr] [xwayland/server.c:454] Cannot find Xwayland binary "/usr/bin/Xwayland"
00:00:00.329 [sway/server.c:363] Failed to start Xwayland
00:00:00.330 [wlr] [render/allocator/gbm.c:117] gbm_bo_create failed
00:00:00.330 [wlr] [render/swapchain.c:110] Failed to allocate buffer
00:00:00.330 [wlr] [render/allocator/gbm.c:117] gbm_bo_create failed
00:00:00.330 [wlr] [render/swapchain.c:110] Failed to allocate buffer
00:00:00.330 [wlr] [types/output/swapchain.c:109] Swapchain for output 'HEADLESS-1' failed test
00:00:00.330 [sway/config/output.c:525] Failed to commit output HEADLESS-1
Environment variable $DISPLAY not set, ignoring.