title: Can't install Orange: "error: command 'clang' failed with exit status 1"
body: <p>I am trying to install <a href="http://orange.biolab.si/" rel="noreferrer">Orange</a> on my Mac OS X 10.7.3 (Lion) and I keep getting an error when using either pip or building from source. First, I was getting an error that read:</p>
  
  <pre><code>error: command 'gcc-4.0' failed with exit status 1
  </code></pre>
  
  <p>I have Xcode 4, which comes bundled with gcc 4.2.1. So I installed <a href="http://www.python.org/download/" rel="noreferrer">64-bit/32-bit Python 2.7.3</a>, which has gcc 4.2 built in. I also tried to override the compiler choice using:</p>
  
  <pre><code>export CC=gcc-4.2
  </code></pre>
  
  <p>But this produced  a different error:</p>
  
  <pre><code>gcc-4.2 not found, using clang instead
  ...
  error: command 'clang' failed with exit status 1
  </code></pre>
  
  <p>Here is the full log:</p>
  
  <pre><code>$ python setup.py build
  running build
  running build_py
  copying Orange/version.py -&gt; build/lib.macosx-10.6-intel-2.7/Orange
  running build_ext
  gcc-4.2 not found, using clang instead
  building 'Orange.orange' extension
  running pyxtract for Orange.orange
  /Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python ../pyxtract/defvectors.py
  /Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python ../pyxtract/pyprops.py -n orange
  /Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python ../pyxtract/pyxtract.py -m -n orange lib_kernel.cpp lib_components.cpp lib_preprocess.cpp lib_learner.cpp lib_io.cpp lib_vectors.cpp cls_example.cpp cls_value.cpp cls_orange.cpp cls_misc.cpp functions.cpp orange.cpp
  Parsing lib_kernel.cpp
  Parsing lib_components.cpp
  Parsing lib_preprocess.cpp
  Parsing lib_learner.cpp
  Parsing lib_io.cpp
  Parsing lib_vectors.cpp
  Parsing cls_example.cpp
  Parsing cls_value.cpp
  Parsing cls_orange.cpp
  Parsing cls_misc.cpp
  Parsing functions.cpp
  Parsing orange.cpp
  Warning: class 'PearsonCorrelation' will not be picklable
  Warning: class 'ItemsetNodeProxy' will not be picklable
  clang -fno-strict-aliasing -fno-common -dynamic -arch i386 -arch x86_64 -g -O2 -DNDEBUG -g -O3 -I/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -INone -Isource/include -Isource/orange/liblinear -Isource/orange/ppp -Isource/orange/px -I/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c source/orange/assoc.cpp -o build/temp.macosx-10.6-intel-2.7/source/orange/assoc.o -fPIC -fpermissive -fno-common -w -DDARWIN -DORANGE_EXPORTS
  clang: warning: argument unused during compilation: '-fpermissive'
  In file included from source/orange/assoc.cpp:25:
  In file included from source/orange/random.hpp:26:
  In file included from source/orange/root.hpp:25:
  source/orange/garbage.hpp:221:9: error: use of undeclared identifier 'raiseError'
          raiseError("bad cast from %s to %s", typeid(U).name(), typeid(T).name());
          ^
  source/orange/garbage.hpp:253:7: error: use of undeclared identifier 'raiseError'
        raiseError("Orange internal error: NULL pointer to '%s'", TYPENAME(typeid(T)));
        ^
  source/orange/garbage.hpp:261:7: error: use of undeclared identifier 'raiseError'
        raiseError("Orange internal error: NULL pointer to '%s'", TYPENAME(typeid(T)));
        ^
  source/orange/garbage.hpp:301:7: error: use of undeclared identifier 'raiseError'
        raiseError("Orange internal error: NULL pointer to '%s'", TYPENAME(typeid(T)));
        ^
  source/orange/garbage.hpp:312:7: error: use of undeclared identifier 'raiseError'
        raiseError("Orange internal error: NULL pointer to '%s'", TYPENAME(typeid(T)));
        ^
  In file included from source/orange/assoc.cpp:27:
  source/orange/examplegen.hpp:143:38: error: expected member name or ';' after declaration specifiers
    TExampleIterator::TExampleIterator(const TExampleIterator &amp;other);
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
  source/orange/examplegen.hpp:143:38: error: expected ')'
  source/orange/examplegen.hpp:143:37: note: to match this '('
    TExampleIterator::TExampleIterator(const TExampleIterator &amp;other);
                                      ^
  source/orange/assoc.cpp:33:1: error: explicit specialization of 'st_classDescription' after instantiation
  DEFINE_TOrangeVector_classDescription(PAssociationRule, "TAssociationRules", true, ORANGE_API)
  ^
  source/orange/orvector.hpp:105:57: note: expanded from macro 'DEFINE_TOrangeVector_classDescription'
      TClassDescription TOrangeVector&lt; _TYPE, _WRAPPED &gt;::st_classDescription = { _NAME, &amp;typeid(TOrangeVector&lt; _TYPE, _WRAPPED &gt;), &amp;TOrange::st_classDescription, TOrange_properties, TOrange_components };
                                                          ^
  source/orange/ppp/assoc.ppp:111:72: note: implicit instantiation first required here
    {"rules", "association rules", &amp;typeid(POrange), &amp;TAssociationRules::st_classDescription, offsetof(TAssociationClassifier, rules), false, false, 0},
                                                                         ^
  8 errors generated.
  error: command 'clang' failed with exit status 1
  </code></pre>