plasma-desktop's CMakeLists.txt:223 does
find_package(XCB REQUIRED COMPONENTS XCB SHM IMAGE)
and configure aborted with "Could NOT find XCB (missing: XCB_LIBRARIES XCB SHM
IMAGE)" -- libxcb was promoted but plasma-desktop did not depend on it, so it
was absent from that recipe's sysroot.
libxcb supplies xcb and xcb-shm (libxcb-shm.a confirmed staged); IMAGE comes
from xcb-util-image, which needs xcb-util. Both promoted out of recipes/wip/x11
and their tarballs fetched and blake3-verified.
This is the case for xcb on Wayland, not X11 nostalgia: KDE's XWayland
integration and Qt's xcb platform plugin both reference these.
vasilito
68b3916eb1