Hi, In my environment (AIX & MariaDB v10.4.3 or 10.4.4), the following line of sql/wsrep_mysqld.cc : size_t const ip_len= wsrep_host_len(node_addr.c_str(), node_addr.size()); is preprocessed (gcc -E) as: size_t const ip_ff.ip_vhltl.ip_x.ip_xlen = wsrep_host_len(node_addr.c_str(), node_addr.size()); where "ip_len" becomes: ip_ff.ip_vhltl.ip_x.ip_xlen , which is wrong and breaks. This is due to the following macro in AIX /usr/include/netinet/ip.h : #define ip_len ip_ff.ip_flen The attached patch (replace ip_len by ip_len_mdb) is an easy work-around for fixing the issue. However, it may not be the perfect appropriate change. Since I do not master MariaDB, I'd like someone to propose a fully correct fix. Thanks/Regards, Tony Reix