comment fixes (install.mk.in, not dirs.mk.in)

mk/install.mk.in

@@ -3,14 +3,14 @@
 #
 ################################################################################
 #
-# dirs.mk.in
+# install.mk.in
 #
 # This file sets up the installation directories.
 #
 # DO NOT EDIT THIS FILE!
 #
-# 	- dirs.mk is auto-generated from dirs.mk.in by configure.
-#	  If you edit dirs.mk your changes will be spammed.
+# 	- install.mk is auto-generated from install.mk.in by configure.
+#	  If you edit install.mk your changes will be spammed.
 #
 #	- Settings in this file may be overriden by giving replacement
 #	  definitions in build.mk.