diff --git a/build-aux/README b/build-aux/README
new file mode 100644
index 0000000..8a0383e
--- /dev/null
+++ b/build-aux/README
@@ -0,0 +1,11 @@
+**************************************************************************
+*                                                                        *
+*              Star Traders: A Game of Interstellar Trading              *
+*                 Copyright (C) 1990-2011, John Zaitseff                 *
+*                                                                        *
+**************************************************************************
+
+This  directory, "build-aux", contains  auxiliary build-related  files for
+Star Traders.  Apart  from "bootstrap", all files are  generated by either
+Autoconf,  Automake or  Gnulib.   The script  "bootstrap" generates  these
+files by running those tools in the correct order.
diff --git a/lib/README b/lib/README
new file mode 100644
index 0000000..9c7b48e
--- /dev/null
+++ b/lib/README
@@ -0,0 +1,9 @@
+**************************************************************************
+*                                                                        *
+*              Star Traders: A Game of Interstellar Trading              *
+*                 Copyright (C) 1990-2011, John Zaitseff                 *
+*                                                                        *
+**************************************************************************
+
+This directory, "lib", contains source code as generated by the Gnulib GNU
+Portability Library (http://www.gnu.org/software/gnulib/) "gnulib-tool".
diff --git a/m4/README b/m4/README
new file mode 100644
index 0000000..de2bbec
--- /dev/null
+++ b/m4/README
@@ -0,0 +1,22 @@
+**************************************************************************
+*                                                                        *
+*              Star Traders: A Game of Interstellar Trading              *
+*                 Copyright (C) 1990-2011, John Zaitseff                 *
+*                                                                        *
+**************************************************************************
+
+This directory, "m4", contains M4 macros used by Autoconf.
+
+The following macros are from the Autoconf Archive project, as detailed on
+that project's web site, http://www.gnu.org/software/autoconf-archive/:
+
+    ax_append_flag.m4
+    ax_cflags_warn_all.m4
+    ax_c___attribute__.m4
+    ax_with_curses.m4
+
+The following macro  was generated by running the  GNU Portability Library
+"gnulib-tool" with  appropriate command line options, as  detailed on that
+project's web site, http://www.gnu.org/software/gnulib/:
+
+    gnulib-cache.m4