Oh I have 32bit ubuntu 11.10, hold on let me build it for you.
Sorry couldn't get it to build, would get stuck during make. Wouldn't even build at first due to missing json.h so I installed json-c and would end up with the following errors (Much more then these, small portion):
App.cpp: In function 'void SubmitShare(Curl&, Share&, unsigned char*)':
App.cpp:133:3: error: 'Json' has not been declared
App.cpp:133:15: error: expected ';' before 'root'
App.cpp:134:3: error: 'Json' has not been declared
App.cpp:134:16: error: expected ';' before 'reader'
App.cpp:135:24: error: 'reader' was not declared in this scope
App.cpp:135:42: error: 'root' was not declared in this scope
Hope someone else can get it working for you.