diff --git a/.gitignore b/.gitignore
index 21264bf..da0d27f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+*.h.in~
 *.o
 core
 .gdb_history
@@ -10,6 +11,7 @@ core
 *.orig
 *.patch
 *.rej
+/tests/run.sh
 
 /aclocal.m4
 /autom4te.cache/
diff --git a/configure.ac b/configure.ac
index 28261de..95ce2c1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,3 +1,16 @@
+dnl configure.ac
+dnl m4 preprocessor script for autotools
+dnl
+dnl Copyright (c) 2011, 2012 William Pitcock <nenolod@dereferenced.org>.
+dnl
+dnl Permission to use, copy, modify, and/or distribute this software for any
+dnl purpose with or without fee is hereby granted, provided that the above
+dnl copyright notice and this permission notice appear in all copies.
+dnl
+dnl This software is provided 'as is' and without any warranty, express or
+dnl implied.  In no event shall the authors be liable for any damages arising
+dnl from the use of this software.
+
 AC_PREREQ([2.68])
 AC_INIT([pkgconf], [0.8.1], [http://github.com/nenolod/pkgconf/issues])
 AC_CONFIG_SRCDIR([pkg.c])