After pip install python-rapidjson
The following output happens
Collecting python-rapidjson
Using cached python-rapidjson-0.0.11.tar.gz
Installing collected packages: python-rapidjson
Running setup.py install for python-rapidjson ... error
Complete output from command /Library/Frameworks/Python.framework/Versions/3.4/bin/python3.4 -u -c "import setuptools, tokenize;file='/private/var/folders/cm/dwsx5_yn5p92nzfyrn8g68wr0000gn/T/pip-build-4fiy0ttq/python-rapidjson/setup.py';f=getattr(tokenize, 'open', open)(file);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" install --record /var/folders/cm/dwsx5_yn5p92nzfyrn8g68wr0000gn/T/pip-8yx2m6bb-record/install-record.txt --single-version-externally-managed --compile:
running install
running build
running build_ext
building 'rapidjson' extension
creating build
creating build/temp.macosx-10.6-intel-3.4
creating build/temp.macosx-10.6-intel-3.4/python-rapidjson
gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch i386 -arch x86_64 -g -I./rapidjson/include -I/Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m -c ./python-rapidjson/rapidjson.cpp -o build/temp.macosx-10.6-intel-3.4/./python-rapidjson/rapidjson.o -pedantic
In file included from /Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m/Python.h:78,
from ./python-rapidjson/rapidjson.cpp:1:
/Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m/longobject.h:88: error: ISO C++ does not support 'long long'
/Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m/longobject.h:89: error: ISO C++ does not support 'long long'
/Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m/longobject.h:90: error: ISO C++ does not support 'long long'
/Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m/longobject.h:91: error: ISO C++ does not support 'long long'
/Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m/longobject.h:92: error: ISO C++ does not support 'long long'
/Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m/longobject.h:93: error: ISO C++ does not support 'long long'
In file included from ./rapidjson/include/rapidjson/writer.h:21,
from ./python-rapidjson/rapidjson.cpp:11:
./rapidjson/include/rapidjson/internal/dtoa.h:32: warning: unknown option after '#pragma GCC diagnostic' kind
In file included from /Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m/Python.h:78,
from ./python-rapidjson/rapidjson.cpp:1:
/Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m/longobject.h:88: error: ISO C++ does not support 'long long'
/Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m/longobject.h:89: error: ISO C++ does not support 'long long'
/Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m/longobject.h:90: error: ISO C++ does not support 'long long'
/Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m/longobject.h:91: error: ISO C++ does not support 'long long'
/Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m/longobject.h:92: error: ISO C++ does not support 'long long'
/Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m/longobject.h:93: error: ISO C++ does not support 'long long'
In file included from ./rapidjson/include/rapidjson/writer.h:21,
from ./python-rapidjson/rapidjson.cpp:11:
./rapidjson/include/rapidjson/internal/dtoa.h:32: warning: unknown option after '#pragma GCC diagnostic' kind
fatal error: /Library/Developer/CommandLineTools/usr/bin/lipo: can't figure out the architecture type of: /var/folders/cm/dwsx5_yn5p92nzfyrn8g68wr0000gn/T//cccQX3Nv.out
error: command 'gcc-4.2' failed with exit status 1

----------------------------------------

Command "/Library/Frameworks/Python.framework/Versions/3.4/bin/python3.4 -u -c "import setuptools, tokenize;file='/private/var/folders/cm/dwsx5_yn5p92nzfyrn8g68wr0000gn/T/pip-build-4fiy0ttq/python-rapidjson/setup.py';f=getattr(tokenize, 'open', open)(file);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" install --record /var/folders/cm/dwsx5_yn5p92nzfyrn8g68wr0000gn/T/pip-8yx2m6bb-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/cm/dwsx5_yn5p92nzfyrn8g68wr0000gn/T/pip-build-4fiy0ttq/python-rapidjson/

Have tried to uninstall XCode and install Command Line tools, didnt help.
Currently

gcc --version

Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.4.0
Thread model: posix