Add GNU Project notice.

* JOIN-GNU: New file. Inspired by a suggestion from José E. Marchesi
on the gnu-prog-discuss mailing list.
* README: Refer to it.
* Makefile.in (SOURCE_FILES): Add it.

4 files changed, 31 insertions, 2 deletions

diff --git a/ChangeLog b/ChangeLog
index 6c9d1d6..09280a5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2022-05-22  Bruno Haible  <bruno@clisp.org>
+
+	Add GNU Project notice.
+	* JOIN-GNU: New file. Inspired by a suggestion from José E. Marchesi
+	on the gnu-prog-discuss mailing list.
+	* README: Refer to it.
+	* Makefile.in (SOURCE_FILES): Add it.
+
 2022-02-07  Bruno Haible  <bruno@clisp.org>
 
 	tests: Fix undefined behaviour.
diff --git a/JOIN-GNU b/JOIN-GNU
new file mode 100644
index 0000000..e3f18d4
--- /dev/null
+++ b/JOIN-GNU
@@ -0,0 +1,19 @@
+Join the GNU Project
+====================
+
+GNU gperf is part of the GNU Operating System, developed by the GNU Project.
+
+If you are the author of an awesome program and want to join us in
+writing Free (libre) Software, please consider making it an official
+GNU program and become a GNU Maintainer.  Instructions on how to do
+this are here:
+  https://www.gnu.org/help/evaluation
+We are looking forward to hacking with you!
+
+Don't have a program to contribute?  Look at all the other ways to help:
+  https://www.gnu.org/help/help.html
+
+And to learn more about Free (libre) Software in general, please read
+and share this page:
+  https://gnu.org/philosophy/free-sw.html
+
diff --git a/Makefile.in b/Makefile.in
index f9b79b6..a49eaf2 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1,6 +1,6 @@
 # Makefile for gperf
 
-# Copyright (C) 1989, 1992-1993, 1998, 2012, 2016, 2018, 2020 Free Software Foundation, Inc.
+# Copyright (C) 1989, 1992-1993, 1998, 2012, 2016, 2018, 2020, 2022 Free Software Foundation, Inc.
 # Written by Douglas C. Schmidt <schmidt@ics.uci.edu>
 # and Bruno Haible <bruno@clisp.org>.
 #
@@ -60,7 +60,7 @@ maintainer-clean : force
 
 # List of source files.
 SOURCE_FILES = \
-  README INSTALL.windows NEWS AUTHORS \
+  README INSTALL.windows NEWS AUTHORS JOIN-GNU \
   configure.ac aclocal.m4 Makefile.in \
   Makefile.devel ChangeLog
 # List of distributed files imported from other packages.
diff --git a/README b/README
index 47b86d8..91feb38 100644
--- a/README
+++ b/README
@@ -13,6 +13,8 @@ See the file NEWS for a list of major changes in the current release.
 
 See the file INSTALL for compilation and installation instructions.
 
+See the file JOIN-GNU to read how you can join the GNU project.
+
 Output from the GPERF program is used to recognize reserved words in
 the GNU C, GNU C++, and GNU Pascal compilers, as well as with the GNU
 indent program.