diff --git a/aclocal/ax_lib_event.m4 b/aclocal/ax_lib_event.m4
index 4193a7b..3a48156 100644
--- a/aclocal/ax_lib_event.m4
+++ b/aclocal/ax_lib_event.m4
@@ -27,6 +27,11 @@
 dnl @category C
 dnl @version 2007-09-12
 dnl @license AllPermissive
+dnl
+dnl Copyright (C) 2009 David Reiss
+dnl Copying and distribution of this file, with or without modification,
+dnl are permitted in any medium without royalty provided the copyright
+dnl notice and this notice are preserved.
 
 dnl Input: ax_libevent_path, WANT_LIBEVENT_VERSION
 dnl Output: success=yes/no
diff --git a/aclocal/ax_lib_zlib.m4 b/aclocal/ax_lib_zlib.m4
index be4b6bb..8c10ab4 100644
--- a/aclocal/ax_lib_zlib.m4
+++ b/aclocal/ax_lib_zlib.m4
@@ -25,6 +25,11 @@
 dnl @category C
 dnl @version 2007-09-12
 dnl @license AllPermissive
+dnl
+dnl Copyright (C) 2009 David Reiss
+dnl Copying and distribution of this file, with or without modification,
+dnl are permitted in any medium without royalty provided the copyright
+dnl notice and this notice are preserved.
 
 dnl Input: ax_zlib_path, WANT_ZLIB_VERSION
 dnl Output: success=yes/no
diff --git a/aclocal/ax_thrift_internal.m4 b/aclocal/ax_thrift_internal.m4
index 9348f4a..979bec6 100644
--- a/aclocal/ax_thrift_internal.m4
+++ b/aclocal/ax_thrift_internal.m4
@@ -9,6 +9,11 @@
 dnl
 dnl @version 2008-02-20
 dnl @license AllPermissive
+dnl
+dnl Copyright (C) 2009 David Reiss
+dnl Copying and distribution of this file, with or without modification,
+dnl are permitted in any medium without royalty provided the copyright
+dnl notice and this notice are preserved.
 
 AC_DEFUN([AX_THRIFT_GEN],
          [
diff --git a/lib/php/src/ext/thrift_protocol/config.m4 b/lib/php/src/ext/thrift_protocol/config.m4
index b5932f5..8cfb37d 100644
--- a/lib/php/src/ext/thrift_protocol/config.m4
+++ b/lib/php/src/ext/thrift_protocol/config.m4
@@ -1,3 +1,8 @@
+dnl Copyright (C) 2009 Facebook
+dnl Copying and distribution of this file, with or without modification,
+dnl are permitted in any medium without royalty provided the copyright
+dnl notice and this notice are preserved.
+
 PHP_ARG_ENABLE(thrift_protocol, whether to enable the thrift_protocol extension,
 [  --enable-thrift_protocol	Enable the fbthrift_protocol extension])