Index: extra/mariabackup/xtrabackup.cc
--- extra/mariabackup/xtrabackup.cc.orig
+++ extra/mariabackup/xtrabackup.cc
@@ -1063,6 +1063,8 @@ static std::string filename_to_spacename(const void *f
     if (f[i] == '\\')
       f[i] = '/';
   }
+#elif defined(__OpenBSD__)
+  return 0;
 #endif
 
   /* Remove extension, if exists */
