diff --git a/logging/funcs_multilogger_mgr_oldnix.go b/logging/funcs_multilogger_mgr_oldnix.go
new file mode 100644
index 0000000..179c16f
--- /dev/null
+++ b/logging/funcs_multilogger_mgr_oldnix.go
@@ -0,0 +1,41 @@
+//go:build !(windows || plan9 || wasip1 || js || ios || linux)
+// +build !windows,!plan9,!wasip1,!js,!ios,!linux
+
+// Linux is excluded because it has its own.
+
+package logging
+
+import (
+	"github.com/google/uuid"
+)
+
+/*
+AddDefaultLogger adds a default Logger (as would be determined by GetLogger) to a MultiLogger.
+
+identifier is a string to use to identify the added Logger in MultiLogger.Loggers.
+If empty, one will be automatically generated.
+
+See the documentation for GetLogger for details on other arguments.
+*/
+func (m *MultiLogger) AddDefaultLogger(identifier string, logFlags int, logPaths ...string) (err error) {
+
+	var l Logger
+	var exists bool
+
+	if identifier == "" {
+		identifier = uuid.New().String()
+	}
+
+	if _, exists = m.Loggers[identifier]; exists {
+		err = ErrExistingLogger
+		return
+	}
+
+	if l, err = GetLogger(m.EnableDebug, m.Prefix, logFlags, logPaths...); err != nil {
+		return
+	}
+
+	m.Loggers[identifier] = l
+
+	return
+}