[groff] 01/06: HACKING: Offer advice, resource for POSIX Issue 4.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 27057ea197f108ba657cc2f8bc4546de6c479946
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Mon Feb 13 18:17:34 2023 -0600

    HACKING: Offer advice, resource for POSIX Issue 4.
---
 HACKING | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/HACKING b/HACKING
index 318f9f8fb..9084c86b5 100644
--- a/HACKING
+++ b/HACKING
@@ -1,4 +1,4 @@
-    Copyright 2022 Free Software Foundation, Inc.
+    Copyright 2022-2023 Free Software Foundation, Inc.
 
     Copying and distribution of this file, with or without
     modification, are permitted in any medium without royalty provided
@@ -77,6 +77,12 @@ Writing Tests
 
 Here are some portability notes on writing automated tests.
 
+* Write to the POSIX standard for the shell and utilities where
+  possible.  Issue 4 from 1994 is old enough that no contemporary system
+  has a good reason for not conforming.  A copy of the standard is
+  available at the Open Group's web site.
+    https://pubs.opengroup.org/onlinepubs/009656399/toc.pdf
+
 * The "od" command on macOS can put extra space characters (i.e., spaces
   that don't correspond to the input) at the ends of lines when using
   the "od -t c" format; GNU od does not.