Unable to install openfst python library on Mac OS X Yosemite
Question: I have been trying to install openfst python library for the last week,
however I am stuck. I have read all similar questions on stack overflow and
other websites but none of the instructions work. I have the latest Xcode
installed, using

    
    
    brew install openfst
    

I also installed openfst, however when I want to install the python library by
writing:

    
    
    pip install openfst
    

in the terminal, I get:

    
    
    Collecting openfst
      Using cached openfst-1.5.0.tar.gz
    Building wheels for collected packages: openfst
      Running setup.py bdist_wheel for openfst
      Complete output from command /Users/ali/anaconda/bin/python -c "import setuptools;__file__='/private/var/folders/36/0m4j84pd49l55mvcqmbqt3z00000gn/T/pip-build-Jqe8Nu/openfst/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" bdist_wheel -d /var/folders/36/0m4j84pd49l55mvcqmbqt3z00000gn/T/tmpFNyllkpip-wheel-:
      running bdist_wheel
      running build
      running build_ext
      building 'fst' extension
      creating build
      creating build/temp.macosx-10.5-x86_64-2.7
      gcc -fno-strict-aliasing -I/Users/ali/anaconda/include -arch x86_64 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Users/ali/anaconda/include/python2.7 -c fst.cc -o build/temp.macosx-10.5-x86_64-2.7/fst.o -std=c++11 -Wno-unneeded-internal-declaration -Wno-unused-function
      In file included from fst.cc:241:
      /usr/local/include/fst/util.h:24:10: fatal error: 'unordered_map' file not found
      #include <unordered_map>
               ^
      1 error generated.
      error: command 'gcc' failed with exit status 1
    
      ----------------------------------------
      Failed building wheel for openfst
    Failed to build openfst
    Installing collected packages: openfst
      Running setup.py install for openfst
        Complete output from command /Users/ali/anaconda/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/36/0m4j84pd49l55mvcqmbqt3z00000gn/T/pip-build-Jqe8Nu/openfst/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/36/0m4j84pd49l55mvcqmbqt3z00000gn/T/pip-oi7XrR-record/install-record.txt --single-version-externally-managed --compile:
        running install
        running build
        running build_ext
        building 'fst' extension
        gcc -fno-strict-aliasing -I/Users/ali/anaconda/include -arch x86_64 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Users/ali/anaconda/include/python2.7 -c fst.cc -o build/temp.macosx-10.5-x86_64-2.7/fst.o -std=c++11 -Wno-unneeded-internal-declaration -Wno-unused-function
        In file included from fst.cc:241:
        /usr/local/include/fst/util.h:24:10: fatal error: 'unordered_map' file not found
        #include <unordered_map>
                 ^
        1 error generated.
        error: command 'gcc' failed with exit status 1
    
        ----------------------------------------
    Command "/Users/ali/anaconda/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/36/0m4j84pd49l55mvcqmbqt3z00000gn/T/pip-build-Jqe8Nu/openfst/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/36/0m4j84pd49l55mvcqmbqt3z00000gn/T/pip-oi7XrR-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/36/0m4j84pd49l55mvcqmbqt3z00000gn/T/pip-build-Jqe8Nu/openfst
    

Could someone please help me?


Answer: I would suggest compiling OpenFST from source with Python enabled. It's pretty
easy:

    
    
    wget http://www.openfst.org/twiki/pub/FST/FstDownload/openfst-1.5.3.tar.gz
    tar zxvf openfst-1.5.3.tar.gz
    cd openfst-1.5.3
    ./configure --enable-python
    make
    sudo make install
    

