I forgot to include the new Makefile.am in contrib/MacOSX/ngIRCd.xcodeproj/ ...
--- /dev/null
+#
+# ngIRCd -- The Next Generation IRC Daemon
+# Copyright (c)2001-2008 Alexander Barton <alex@barton.de>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+# Please read the file COPYING, README and AUTHORS for more information.
+#
+
+EXTRA_DIST = project.pbxproj
+
+maintainer-clean-local:
+ rm -f Makefile Makefile.in
+
+# -eof-