Index: extra/mariabackup/xtrabackup.cc
--- extra/mariabackup/xtrabackup.cc.orig
+++ extra/mariabackup/xtrabackup.cc
@@ -7122,6 +7122,8 @@ static int get_exepath(char *buf, size_t size, const c
   if (sysctl(mib, 4, buf, &size, NULL, 0) == 0) {
     return 0;
   }
+#elif defined(__OpenBSD__)
+  return 0;
 #endif
 
   return my_realpath(buf, argv0, 0);