From ad24cfcd55c8990f4aefafb0b2f797ce4371b19f Mon Sep 17 00:00:00 2001
From: Simon McVittie <smcv@debian.org>
Date: Wed, 22 Jul 2015 08:15:18 +0100
Subject: [PATCH] build: if tput fails, fall back to a reasonable text width

If TERM is not set (which can happen in autobuilders and other
batch environments), or if tput cannot determine the number of
columns for some other reason, then it can fail and not produce
any output. Prior to this change, that would result in passing
field width -4 to fmt, which is an error and causes fmt to
produce no output.
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index edd0cdb6..825307ff 100644
--- a/Makefile
+++ b/Makefile
@@ -1231,7 +1231,7 @@ release:
 	  CLIENT_CFLAGS="$(CLIENT_CFLAGS)" SERVER_CFLAGS="$(SERVER_CFLAGS)" V=$(V)
 
 ifneq ($(call bin_path, tput),)
-  TERM_COLUMNS=$(shell echo $$((`tput cols`-4)))
+  TERM_COLUMNS=$(shell if c=`tput cols`; then echo $$(($$c-4)); else echo 76; fi)
 else
   TERM_COLUMNS=76
 endif