mrd8657@linux-new:~$ g++-4.6 hw4pr4.cpp -std=c++0x -o test1
/tmp/cc7zyF98.o: In function `main':
hw4pr4.cpp:(.text+0x1f): undefined reference to `Chrono::Date::Date()'
hw4pr4.cpp:(.text+0x2a): undefined reference to `Chrono::Date::Date()'
hw4pr4.cpp:(.text+0x35): undefined reference to `Chrono::Date::Date()'
hw4pr4.cpp:(.text+0x5c): undefined reference to `Chrono::operator>>(std::basic_i stream<char, std::char_traits<char> >&, Chrono::Date&)'
hw4pr4.cpp:(.text+0xb9): undefined reference to `Chrono::Date::operator++(int)'
hw4pr4.cpp:(.text+0xe0): undefined reference to `Chrono::operator!=(Chrono::Date  const&, Chrono::Date const&)'
hw4pr4.cpp:(.text+0x10a): undefined reference to `Chrono::operator==(Chrono::Dat e const&, Chrono::Date const&)'
hw4pr4.cpp:(.text+0x12d): undefined reference to `Chrono::Date::operator++()'
hw4pr4.cpp:(.text+0x13c): undefined reference to `Chrono::operator!=(Chrono::Dat e const&, Chrono::Date const&)'
hw4pr4.cpp:(.text+0x177): undefined reference to `Chrono::operator<<(std::basic_ ostream<char, std::char_traits<char> >&, Chrono::Date const&)'
collect2: ld returned 1 exit status