function 'initwbxml' should not return a value #1

/usr/bin/clang -fno-strict-aliasing -fno-common -dynamic -arch i386 -arch x86_64 -g -O2 -DNDEBUG -g -O3 -I/opt/local/include/ -I/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c src/wbxml.c -o build/temp.macosx-10.6-x86_64-2.7/src/wbxml.o
    src/wbxml.c:93:5: error: void function 'initwbxml' should not return a value [-Wreturn-type]
        return NULL;
        ^      ~~~~
    1 error generated.
    error: command '/usr/bin/clang' failed with exit status 1