Update to opus-HEAD-66611f1.

INSTALL

 Installation Instructions
 *************************
 
-Copyright (C) 1994-1996, 1999-2002, 2004-2011 Free Software Foundation,
+Copyright (C) 1994-1996, 1999-2002, 2004-2013 Free Software Foundation,
 Inc.
 
    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 warranty of any kind.
 
 Basic Installation
 ==================
 
-   Briefly, the shell commands `./configure; make; make install' should
-configure, build, and install this package.  The following
+   Briefly, the shell command `./configure && make && make install'
+should configure, build, and install this package.  The following
 more-detailed instructions are generic; see the `README' file for
 instructions specific to this package.  Some packages provide this
 `INSTALL' file but do not implement all of the features documented
 below.  The lack of an optional feature in a given package is not
 necessarily a bug.  More recommendations for GNU packages can be found
 in *note Makefile Conventions: (standards)Makefile Conventions.
 
    The `configure' shell script attempts to guess correct values for
 various system-dependent variables used during compilation.  It uses
 those values to create a `Makefile' in each directory of the package.
@@ skipping 275 matching lines @@
 configure again during the build, and the customized values of these
 variables may be lost.  In order to avoid this problem, you should set
 them in the `configure' command line, using `VAR=value'.  For example:
 
      ./configure CC=/usr/local2/bin/gcc
 
 causes the specified `gcc' to be used as the C compiler (unless it is
 overridden in the site shell script).
 
 Unfortunately, this technique does not work for `CONFIG_SHELL' due to
-an Autoconf bug.  Until the bug is fixed you can use this workaround:
+an Autoconf limitation.  Until the limitation is lifted, you can use
+this workaround:
 
-     CONFIG_SHELL=/bin/bash /bin/bash ./configure CONFIG_SHELL=/bin/bash
+     CONFIG_SHELL=/bin/bash ./configure CONFIG_SHELL=/bin/bash
 
 `configure' Invocation
 ======================
 
    `configure' recognizes the following options to control how it
 operates.
 
 `--help'
 `-h'
      Print a summary of all of the options to `configure', and exit.
@@ skipping 35 matching lines @@
      for more details, including other options available for fine-tuning
      the installation locations.
 
 `--no-create'
 `-n'
      Run the configure checks, but stop before creating any output
      files.
 
 `configure' also accepts some other, not widely useful, options.  Run
 `configure --help' for more details.
-