Can't build i586 on Mac following instructions

[ShengRang]

using 1.11.99 , following the installation_mac in doc.

Everything works exactly right until this step:

 cp ${ZEPHYR_BASE}/scripts/cross_compiler/x86.config .config
export CT_PREFIX=/Volumes/CrossToolNG
ct-ng oldconfig

After ct-ng oldconfig, the file .config looks like this:

however in document, it said the .config should look like:

...
CT_LOCAL_TARBALLS_DIR="/Volumes/CrossToolNG/src"
# CT_SAVE_TARBALLS is not set
CT_WORK_DIR="${CT_TOP_DIR}/.build"
CT_PREFIX_DIR="/Volumes/CrossToolNG/x-tools/${CT_TARGET}"
CT_INSTALL_DIR="${CT_PREFIX_DIR}"
# Following options prevent link errors
CT_WANTS_STATIC_LINK=n
CT_CC_STATIC_LIBSTDCXX=n
...

I think it might cause by the document is behind latest source code, so I run ct-ng build.
When finished, the toolchain should be available under /Volumes/CrossToolNG/x-tools, but in my /Volumes/CrossToolNG there is just a i586-zephyr-elf folder.

tree -L 2 -a
.
├── .DS_Store
├── .Trashes [error opening dir]
├── .fseventsd
│   ├── 00000000008588fa
....
│   └── fseventsd-uuid
├── build
│   ├── .build
│   ├── .config
│   ├── .config.old
│   ├── build.log.bak
│   ├── build.log_04031008
│   ├── config -> /usr/local/lib/crosstool-ng-1.23.0/config
│   └── config.gen
└── i586-zephyr-elf
    ├── bin
    ├── build.log.bz2
    ├── i586-zephyr-elf
    ├── include
    ├── lib
    ├── libexec
    └── share

There is no such x-tools.
I think it might build successfully. but when I try to run samples/hello_world,

export ZEPHYR_TOOLCHAIN_VARIANT=xtools
export XTOOLS_TOOLCHAIN_PATH=/Volumes/CrossToolNG
export ZEPHYR_TOOLCHAIN_VARIANT=xtools
export ZEPHYR_SDK_INSTALL_DIR=/Volumes/CrossToolNG
cd $ZEPHYR_BASE/samples/hello_world
mkdir build && cd build

Then I run cmake -GNinja -DBOARD=qemu_x86 .. and get this:

CMake Deprecation Warning at /Users/***/project/zephyr/cmake/app/boilerplate.cmake:38 (cmake_policy):
  The OLD behavior for policy CMP0000 will be removed from a future version
  of CMake.

  The cmake-policies(7) manual explains that the OLD behaviors of all
  policies are deprecated and that a policy should be set to OLD only under
  specific short-term circumstances.  Projects should be ported to the NEW
  behavior and not rely on setting a policy to OLD.
Call Stack (most recent call first):
  CMakeLists.txt:2 (include)


-- Found PythonInterp: /usr/local/bin/python3.4 (found suitable version "3.4.2", minimum required is "3.4")
-- Selected BOARD qemu_x86
Zephyr version: 1.11.99
CMake Error at /Users/***/project/zephyr/cmake/host-tools-zephyr.cmake:24 (message):
  The file '/Volumes/CrossToolNG/sdk_version' was not found.  Is
  ZEPHYR_SDK_INSTALL_DIR=/Volumes/CrossToolNG misconfigured?
Call Stack (most recent call first):
  /Users/***/project/zephyr/cmake/host-tools.cmake:1 (include)
  /Users/***/project/zephyr/cmake/app/boilerplate.cmake:240 (include)
  CMakeLists.txt:2 (include)


-- Configuring incomplete, errors occurred!