We got a downstream kcoreaddons-5.53 build failure report with GCC-7.3.0 and Qt-5.11.3: moc_kaboutdata.cpp:311:69: error: invalid use of incomplete type ‘class QVariant’ It was fixed by commit e53254a009982c379a5ad713139e88a881ca02fb, I believe this should be part of a 5.53.1 bump. Regards, Andreas