From b84d3f849be5d858d8348a741f6b8ccd881509fe Mon Sep 17 00:00:00 2001
From: David Levine <levinedl@acm.org>
Date: Wed, 8 Jan 2014 18:23:10 -0600
Subject: [PATCH] Detect whether or not to use -n with tail in build_nmh.
 Synched that to uip/mhmail.

---
 docs/contrib/build_nmh | 7 ++++++-
 uip/mhmail             | 9 ++++-----
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/docs/contrib/build_nmh b/docs/contrib/build_nmh
index cb2265cb..b00ad90f 100755
--- a/docs/contrib/build_nmh
+++ b/docs/contrib/build_nmh
@@ -119,6 +119,11 @@ finddir() {
   esac
 }
 
+#### Figure out whether or not to use -n with tail.
+case `printf 'OK\n' | tail -n 1 2>&1` in
+  OK) tail='tail -n ' ;;
+  *)  tail='tail -' ;;
+esac
 
 if install-mh -check >/dev/null 2>&1; then
   # Determine config options from installed nmh.
@@ -290,7 +295,7 @@ if [ $status -eq 0 ]; then
       echo "$tests_summary" >>"$logfile"
       echo '===================' >>"$logfile"
       [ "$check" = distcheck ]  &&  \
-        echo "$checkoutput" | tail -n 4 >>"$logfile"
+        echo "$checkoutput" | ${tail}4 >>"$logfile"
     fi
 
     if [ $status -eq 0 ]; then
diff --git a/uip/mhmail b/uip/mhmail
index a00d7cc9..916732d8 100755
--- a/uip/mhmail
+++ b/uip/mhmail
@@ -50,11 +50,10 @@ finddir() {
 
 bindir=`finddir $0`
 nmhbindir=`cd "$bindir" && pwd`
-if printf 'OK\n' | tail -n 1 2>&1 | grep OK >/dev/null; then
-    tail='tail -n'
-else
-    tail='tail -'
-fi
+case `printf 'OK\n' | tail -n 1 2>&1` in
+  OK) tail='tail -n ' ;;
+  *)  tail='tail -' ;;
+esac
 
 
 #### Checks for missing mandatory arguments.
-- 
2.56.0