title: Waf configure error, cannot find pyembed for some reason
body: <p>I'm trying to configure Planck Likelihood Code using ./waf, but I keep getting the following error after calling <code>./waf configure CC=gcc python=/opt/local/bin/python cfitsio_lib=/opt/local/lib cfitsio_include=/opt/local/include --lapack_mkl=${MKLROOT} --install_all_deps</code>:</p>
  <pre><code>Testing pyembed configuration: Could not build a python embedded interpreter
  No suitable python distribution found 
  Cause: 'The configuration failed'
  </code></pre>
  <p>I have no idea how to proceed from here... Any suggestions would be greatly appreciated.</p>
  <p>Here is the relevant part from the <code>config.log</code> file for the configuration attempt also. I'm using Python 2.7 on Mac OS, and it seems to be installed fine (as far as I can tell).</p>
  <pre><code>python-config
  /opt/local/bin/python2.7-config
  find program=['/opt/local/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python-config', 'python2.7-config', 'python-config-2.7', 'python2.7m-config'] paths=['/Users/USER/Desktop/montepython_public-3.3/montepython/', '/opt/local/bin', '/opt/local/sbin', '/usr/local/bin', '/usr/bin', '/bin', '/usr/sbin', '/sbin', '/Library/TeX/texbin', '/Library/Apple/usr/bin'] var='PYTHON_CONFIG' -&gt; ['/opt/local/bin/python2.7-config']
  --------------------------------------------------------------------------
  Asking python-config for pyembed '--cflags --libs --ldflags --embed' flags
  ['/opt/local/bin/python2.7-config', '--cflags', '--libs', '--ldflags', '--embed']
  err: Usage: /opt/local/bin/python2.7-config [--prefix|--exec-prefix|--includes|--libs|--cflags|--ldflags|--help]
  
  not found
  from /Users/USER/Desktop/code/plc_3.0/plc-3.01: The configuration failed
  --------------------------------------------------------------------------
  Asking python-config for pyembed '--cflags --libs --ldflags' flags
  ['/opt/local/bin/python2.7-config', '--cflags', '--libs', '--ldflags']
  out: -I/opt/local/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -I/opt/local/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -fno-strict-aliasing -fno-common -dynamic -pipe -Os -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes
  -lpython2.7 -lintl -ldl -framework CoreFoundation
  -L/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/config -lpython2.7 -lintl -ldl -framework CoreFoundation
  
  Unhandled flag '-pipe'
  Unhandled flag '-Wall'
  Unhandled flag '-Wstrict-prototypes'
  yes
  --------------------------------------------------------------------------
  Testing pyembed configuration
  ==&gt;
  
  #include &lt;Python.h&gt;
  #ifdef __cplusplus
  extern &quot;C&quot; {
  #endif
      void Py_Initialize(void);
      void Py_Finalize(void);
  #ifdef __cplusplus
  }
  #endif
  int main(int argc, char **argv)
  {
     (void)argc; (void)argv;
     Py_Initialize();
     Py_Finalize();
     return 0;
  }
  
  &lt;==
  [1/2] Compiling [32mbuild/.conf_check_e02afcfd7f3c9a900cd99ee408c985e3/test.c[0m
  
  ['gcc', '-fno-strict-aliasing', '-fno-common', '-dynamic', '-Os', '-isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk', '-DNDEBUG', '-g', '-fwrapv', '-O3', '-I/opt/local/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7', '-DPYTHONDIR=&quot;/Users/USER/Desktop/code/plc_3.0/plc-3.01/lib/python2.7/site-packages&quot;', '-DPYTHONARCHDIR=&quot;/Users/USER/Desktop/code/plc_3.0/plc-3.01/lib/python2.7/site-packages&quot;', '../test.c', '-c', '-o/Users/USER/Desktop/code/plc_3.0/plc-3.01/build/.conf_check_e02afcfd7f3c9a900cd99ee408c985e3/testbuild/test.c.1.o']
  [2/2] Linking [33mbuild/.conf_check_e02afcfd7f3c9a900cd99ee408c985e3/testbuild/testprog[0m
  
  ['gcc', '-arch', 'x86_64', 'test.c.1.o', '-o/Users/USER/Desktop/code/plc_3.0/plc-3.01/build/.conf_check_e02afcfd7f3c9a900cd99ee408c985e3/testbuild/testprog', '-L/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib', '-L/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/config', '-lm', '-ldl', '-lutil', '-lpthread', '-lpython2.7', '-lintl', '-ldl', '-lpython2.7', '-lintl', '-ldl']
  err: ld: library not found for -lintl
  collect2: error: ld returned 1 exit status
  
  from /Users/USER/Desktop/code/plc_3.0/plc-3.01: Test does not build: Traceback (most recent call last):
    File &quot;/Users/USER/Desktop/code/plc_3.0/plc-3.01/.waf-2.0.17-c5414c9b1eca70e1add79159e16494fe/waflib/Configure.py&quot;, line 325, in run_build
      bld.compile()
    File &quot;/Users/USER/Desktop/code/plc_3.0/plc-3.01/.waf-2.0.17-c5414c9b1eca70e1add79159e16494fe/waflib/Build.py&quot;, line 176, in compile
      raise Errors.BuildError(self.producer.error)
  BuildError: Build failed
   -&gt; task in 'testprog' failed with exit status 1 (run with -v to display more information)
  
  Could not build a python embedded interpreter
  from /Users/USER/Desktop/code/plc_3.0/plc-3.01: The configuration failed
  </code></pre>