Respect the fact that most interactive shells don't restore stty settings

and make it work in non-interactive mode...

config

@@ -503,9 +503,9 @@ case "$GUESSOS" in
   mips4-sgi-irix64)
 	echo "WARNING! If you wish to build 64-bit library, then you have to"
 	echo "         invoke './Configure irix64-mips4-$CC' *manually*."
-	if [ "$TEST" = "false" ]; then
+	if [ "$TEST" = "false" -a -t 1 ]; then
 	  echo "         You have about 5 seconds to press Ctrl-C to abort."
-	  (stty -icanon min 0 time 50; read waste) < /dev/tty
+	  (trap "stty `stty -g`" 2 0; stty -icanon min 0 time 50; read waste) <&1
 	fi
         #CPU=`(hinv -t cpu) 2>/dev/null | head -1 | sed 's/^CPU:[^R]*R\([0-9]*\).*/\1/'`
         #CPU=${CPU:-0}
@@ -536,9 +536,9 @@ case "$GUESSOS" in
   ppc64-*-linux2)
 	echo "WARNING! If you wish to build 64-bit library, then you have to"
 	echo "         invoke './Configure linux-ppc64' *manually*."
-	if [ "$TEST" = "false" ]; then
+	if [ "$TEST" = "false" -a -t 1 ]; then
 	    echo "         You have about 5 seconds to press Ctrl-C to abort."
-	    (stty -icanon min 0 time 50; read waste) < /dev/tty
+	    (trap "stty `stty -g`" 2 0; stty -icanon min 0 time 50; read waste) <&1
 	fi
 	OUT="linux-ppc"
 	;;
@@ -548,9 +548,9 @@ case "$GUESSOS" in
 	echo "WARNING! If you *know* that your GNU C supports 64-bit/V9 ABI"
 	echo "         and wish to build 64-bit library, then you have to"
 	echo "         invoke './Configure linux64-sparcv9' *manually*."
-	if [ "$TEST" = "false" ]; then
+	if [ "$TEST" = "false" -a -t 1 ]; then
 	  echo "          You have about 5 seconds to press Ctrl-C to abort."
-	  (stty -icanon min 0 time 50; read waste) < /dev/tty
+	  (trap "stty `stty -g`" 2 0; stty -icanon min 0 time 50; read waste) <&1
 	fi
 	OUT="linux-sparcv9" ;;
   sparc-*-linux2)
@@ -608,9 +608,9 @@ case "$GUESSOS" in
 	    if [ "$CC" = "cc" -a $CCVER -ge 50 ]; then
 		echo "WARNING! If you wish to build 64-bit library, then you have to"
 		echo "         invoke './Configure solaris64-sparcv9-cc' *manually*."
-		if [ "$TEST" = "false" ]; then
+		if [ "$TEST" = "false" -a -t 1 ]; then
 		  echo "         You have about 5 seconds to press Ctrl-C to abort."
-		  (stty -icanon min 0 time 50; read waste) < /dev/tty
+		  (trap "stty `stty -g`" 2 0; stty -icanon min 0 time 50; read waste) <&1
 		fi
 	    elif [ "$CC" = "gcc" -a "$GCC_ARCH" = "-m64" ]; then
 		# $GCC_ARCH denotes default ABI chosen by compiler driver
@@ -620,17 +620,17 @@ case "$GUESSOS" in
 		OUT="solaris64-sparcv9-gcc"
 		echo "WARNING! If you wish to build 32-bit library, then you have to"
 		echo "         invoke './Configure solaris-sparcv9-gcc' *manually*."
-		if [ "$TEST" = "false" ]; then
+		if [ "$TEST" = "false" -a -t 1 ]; then
 		  echo "         You have about 5 seconds to press Ctrl-C to abort."
-		  (stty -icanon min 0 time 50; read waste) < /dev/tty
+		  (trap "stty `stty -g`" 2 0; stty -icanon min 0 time 50; read waste) <&1
 		fi
 	    elif [ "$GCC_ARCH" = "-m32" ]; then
 		echo "NOTICE! If you *know* that your GNU C supports 64-bit/V9 ABI"
 		echo "        and wish to build 64-bit library, then you have to"
 		echo "        invoke './Configure solaris64-sparcv9-gcc' *manually*."
-		if [ "$TEST" = "false" ]; then
+		if [ "$TEST" = "false" -a -t 1 ]; then
 		  echo "         You have about 5 seconds to press Ctrl-C to abort."
-		  (stty -icanon min 0 time 50; read waste) < /dev/tty
+		  (trap "stty `stty -g`" 2 0; stty -icanon min 0 time 50; read waste) <&1
 		fi
 	    fi
 	fi
@@ -689,9 +689,9 @@ case "$GUESSOS" in
 	     echo "WARNING! 64-bit ABI is the default configured ABI on HP-UXi."
 	     echo "         If you wish to build 32-bit library, the you have to"
 	     echo "         invoke './Configure hpux-ia64-cc' *manually*."
-	     if [ "$TEST" = "false" ]; then
+	     if [ "$TEST" = "false" -a -t 1 ]; then
 		echo "         You have about 5 seconds to press Ctrl-C to abort."
-		(stty -icanon min 0 time 50; read waste) < /dev/tty
+		(trap "stty `stty -g`" 2 0; stty -icanon min 0 time 50; read waste) <&1
 	     fi
 	     OUT="hpux64-ia64-cc"
 	elif [ $CPU_VERSION -ge 532 ]; then	# PA-RISC 2.x CPU
@@ -699,9 +699,9 @@ case "$GUESSOS" in
 	     if [ $KERNEL_BITS -eq 64 -a "$CC" = "cc" ]; then
 		echo "WARNING! If you wish to build 64-bit library then you have to"
 		echo "         invoke './Configure hpux64-parisc2-cc' *manually*."
-		if [ "$TEST" = "false" ]; then
+		if [ "$TEST" = "false" -a -t 1 ]; then
 		  echo "         You have about 5 seconds to press Ctrl-C to abort."
-		  (stty -icanon min 0 time 50; read waste) < /dev/tty
+		  (trap "stty `stty -g`" 2 0; stty -icanon min 0 time 50; read waste) <&1
 		fi
 	     fi
 	elif [ $CPU_VERSION -ge 528 ]; then	# PA-RISC 1.1+ CPU
@@ -727,9 +727,9 @@ case "$GUESSOS" in
 	    if [ $KERNEL_BITS -eq 64 ]; then
 		echo "WARNING! If you wish to build 64-bit kit, then you have to"
 		echo "         invoke './Configure aix64-cc' *manually*."
-		if [ "$TEST" = "false" ]; then
+		if [ "$TEST" = "false" -a -t 1 ]; then
 		    echo "         You have ~5 seconds to press Ctrl-C to abort."
-		    (/bin/stty -icanon min 0 time 50; read waste) < /dev/tty
+		    (trap "stty `stty -g`" 2 0; stty -icanon min 0 time 50; read waste) <&1
 		fi
 	    fi
 	fi