Greetings. Two questions: 1. Could you make precompiled CLN library binaries for Linux (RPM format) available somewhere on the web? 2. What is wrong here? I downloaded and installed GiNaC-0.9.1-1.i386.rpm from ftp://ftpthep.physik.uni-mainz.de/pub/GiNaC/rpm/ and I downloaded and compiled cln-1.1.1.tar.gz. riedel@linuxfast:qselav > cat test.cpp #include <stdio.h> #include <ginac/ginac.h> using namespace std; using namespace GiNaC; static symbol g("g"); static symbol z("z"); int main(int argc, char **argv){ ex T; T=indexed(g, idx(3, 1))*pow(z, 3); cout << T.diff(z) << endl; } riedel@linuxfast:qselav > c++ test.cpp -o testdiff -lcln -lginac /usr/local/lib/libginac.so: undefined reference to `__dynamic_cast_2' collect2: ld returned 1 exit status riedel@linuxfast:qselav > ls -l /usr/local/lib/libginac.so lrwxrwxrwx 1 root root 26 Jul 11 20:24 /usr/local/lib/libginac.so -> /usr/lib/libginac-0.9.so.1 riedel@linuxfast:qselav > Best regards, Marko Riedel