title: mxnet/mxnet/python/mxnet/../../lib/libmxnet.so: undefined symbol: cblas_ddot
body: <p>I tried to install mxnet as follows:
  Operating System:
  RHEL 6.9 (2.6.32-696.el6.x86_64)
  Compiler:
  gcc (GCC) 5.3.0 also tried with 6.2.0</p>
  
  <p>A. OpenBLAS build as</p>
  
  <pre><code> 1. git clone https://github.com/xianyi/OpenBLAS.git
   2. cd OpenBLAS
   3. make DYNAMIC_ARCH=1 NO_AVX2=1
   4. make PREFIX=~/test/OpenBLAS-1.0 install
  </code></pre>
  
  <p>B. mxnet install</p>
  
  <pre><code> 1. git clone --recursive https://github.com/dmlc/mxnet
   2. cd mxnet
   3. modified make/config.mk as follows
      USE_OPENCV = 0  
      USE_BLAS = openblas (#Line no : 93) 
      ADD_LDFLAGS = -I/home_dir/test/OpenBLAS-1.0/lib
      ADD_CFLAGS =  -I/home_dir/test/OpenBLAS-1.0/include
  
   4. make -j4 #It successfully created lib dir  containing libmxnet.a and libmxnet.so
  </code></pre>
  
  <p>Then exported PYTHONPATH as export </p>
  
  <pre><code>`PYTHONPATH=~/test/mxnet/python/`
  </code></pre>
  
  <p>After running python in interactive mode I get the following error:</p>
  
  <pre><code>[c244728_lx@brainiac-login-0001 lib]$ python --version
  Python 3.5.1
  [c244728_lx@brainiac-login-0001 lib]$ python
  Python 3.5.1 (default, Mar  2 2016, 08:58:17)
  [GCC 4.4.7 20120313 (Red Hat 4.4.7-11)] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import mxnet
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "/home/c244728_lx/test/mxnet/python/mxnet/__init__.py", line 25, in &lt;module&gt;
      from .base import MXNetError
    File "/home/c244728_lx/test/mxnet/python/mxnet/base.py", line 86, in &lt;module&gt;
      _LIB = _load_lib()
    File "/home/c244728_lx/test/mxnet/python/mxnet/base.py", line 78, in _load_lib
      lib = ctypes.CDLL(lib_path[0], ctypes.RTLD_LOCAL)
    File "/lrlhps/apps/python/python-3.5.1/lib/python3.5/ctypes/__init__.py", line 347, in __init__
      self._handle = _dlopen(self._name, mode)
  OSError: /home/c244728_lx/test/mxnet/python/mxnet/../../lib/libmxnet.so: undefined symbol: cblas_ddot
  &gt;&gt;&gt;
  </code></pre>
  
  <p>For more description please follow:
   <a href="https://github.com/apache/incubator-mxnet/issues/7397" rel="nofollow noreferrer">github issue</a></p>