Add Makefile, changelog, include err.h, url in README

ChangeLog

@@ -0,0 +1,15 @@
+2020-12-14  Michael Small  <smallm@sdf.org>
+
+	* ansi2text.c: include err.h to avoid implicit declartion warning
+
+2020-12-14  Michael Small  <smallm@sdf.org>
+
+	* ansi2text.c: copy from NetBSD ticket in which Nathanial Sloss
+	submitted it: https://gnats.netbsd.org/48092
+
+	* ansi2text.1: copied from same ticket
+
+------------------------------------------------------------------------
+Copyright 2020 Michael Small
+Copying and distribution of this file, with or without modification, are
+permitted provided the copyright notice and this notice are preserved.

Makefile

@@ -0,0 +1,20 @@
+# Copyright (c) 2020 Michael Small <smallm@sdf.org>
+#
+# Copying and distribution of this file, with or without modification,
+# are permitted in any medium without royalty, provided the copyright
+# notice and this notice are preserved. This file is offered as-is,
+# without any warranty.
+
+PREFIX=/usr/local
+BINDIR=$(PREFIX)/bin
+MANDIR=$(PREFIX)/share/man
+
+all: ansi2text
+
+ansi2text: ansi2text.o
+
+install: ansi2text
+	install -d $(BINDIR) $(MANDIR) $(MANDIR)/man1
+	install -m 755 -t $(BINDIR) ansi2text
+	install -m 444 -t $(MANDIR)/man1 ansi2text.1
+

README

@@ -1,6 +1,6 @@
 A program to strip ansi codes from text files.
 
-Looks to have only appeared in a NetBSD packaging request, problem report 48092.
+Looks to have only appeared in a NetBSD packaging request, problem report 48092
-See netbsd_gnat_pkging_request.origin which was saved from
+by Nathanial Sloss. See netbsd_gnat_pkging_request.origin which was saved from
 https://gnats.netbsd.org/48092
 

ansi2text.c

@@ -24,6 +24,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <err.h>
 #include <fcntl.h>
 #include <inttypes.h>
 #include <limits.h>