PORTREVISION=	1

$ kwin_wayland --xwayland

[...]

kwin_xwl: Failed to find free X11 connection socket

Failed to establish X11 socket

--- src/xwl/lib/xwaylandsocket.cpp.orig	2021-10-26 12:27:37 UTC

+++ src/xwl/lib/xwaylandsocket.cpp

@@ -184,12 +184,14 @@ XwaylandSocket::XwaylandSocket(OperationMode mode)

         }

         const int abstractFileDescriptor = listen_helper(socketFilePath, UnixSocketAddress::Type::Abstract, mode);

+#if defined(Q_OS_LINUX)

         if (abstractFileDescriptor == -1) {

             QFile::remove(lockFilePath);

             QFile::remove(socketFilePath);

             close(unixFileDescriptor);

             continue;

         }

+#endif

         m_socketFilePath = socketFilePath;

         m_lockFilePath = lockFilePath;