environment variables to be a custom command (wrapped by meson to capture output, to feed input) [209/229] Generating waybar-backlight-slider.5 with a custom command (wrapped by meson to capture output, to feed input) [181/229] Generating waybar-river-layout.5 with a custom command (wrapped by meson to capture output, to feed input) [169/229] Generating waybar-bluetooth.5 with