$NetBSD$

also in for *.mk files as makefiles.

--- libidu/id-lang.map.orig	2006-04-29 08:52:05.000000000 -0700
+++ libidu/id-lang.map	2011-04-17 02:13:46.000000000 -0700
@@ -79,6 +79,7 @@
 *.scm			lisp
 
 *.am			make
+*.mk			make
 Makefile		make
 Makefile.*		make
 
