Hello, i'm using Ubuntu 9.04 with g++. I installed Ginac with Synaptik (.deb Packeges), I also installed cln pakeges. But it doesn't works! :) Here is the bug message: g++ -o simple_function simple_function.o -lginac simple_function.o: In function `__static_initialization_and_destruction_0': /usr/local/include/ginac/archive.h:174: undefined reference to `GiNaC::unarchive_table_t::unarchive_table_t()' /usr/local/include/ginac/archive.h:174: undefined reference to `GiNaC::unarchive_table_t::~unarchive_table_t()' simple_function.o: In function `__static_initialization_and_destruction_0': /usr/local/include/ginac/lst.h:45: undefined reference to `GiNaC::lst_unarchiver::lst_unarchiver()' /usr/local/include/ginac/lst.h:45: undefined reference to `GiNaC::lst_unarchiver::~lst_unarchiver()' simple_function.o: In function `__static_initialization_and_destruction_0': /usr/local/include/ginac/constant.h:80: undefined reference to `GiNaC::constant_unarchiver::constant_unarchiver()' /usr/local/include/ginac/constant.h:80: undefined reference to `GiNaC::constant_unarchiver::~constant_unarchiver()' simple_function.o: In function `__static_initialization_and_destruction_0': /usr/local/include/ginac/fail.h:44: undefined reference to `GiNaC::fail_unarchiver::fail_unarchiver()' /usr/local/include/ginac/fail.h:44: undefined reference to `GiNaC::fail_unarchiver::~fail_unarchiver()' simple_function.o: In function `__static_initialization_and_destruction_0': /usr/local/include/ginac/integral.h:82: undefined reference to `GiNaC::integral_unarchiver::integral_unarchiver()' /usr/local/include/ginac/integral.h:82: undefined reference to `GiNaC::integral_unarchiver::~integral_unarchiver()' simple_function.o: In function `__static_initialization_and_destruction_0': /usr/local/include/ginac/matrix.h:178: undefined reference to `GiNaC::matrix_unarchiver::matrix_unarchiver()' /usr/local/include/ginac/matrix.h:178: undefined reference to `GiNaC::matrix_unarchiver::~matrix_unarchiver()' simple_function.o: In function `__static_initialization_and_destruction_0': /usr/local/include/ginac/numeric.h:206: undefined reference to `GiNaC::numeric_unarchiver::numeric_unarchiver()' /usr/local/include/ginac/numeric.h:206: undefined reference to `GiNaC::numeric_unarchiver::~numeric_unarchiver()' simple_function.o: In function `__static_initialization_and_destruction_0': ... i don't understand what he needs, cause i have the same system (Ubuntu 9.04) and the same installation of Ginac at work and it works. I already tried to uninstall and to install new one more time - nothing changes! Please HELP!!!