I'm trying to implement the example that shows how to define a GiNaC expression and to compile an associated C code. My implementation of the 5.15.3 example in ginac_tutorial.pdf is as follows: #include <iostream> #include <ginac/ginac.h> #include <iterator> #include <numeric> using namespace std; using namespace GiNaC; ex HermitePoly(const symbol & x, int n) { ex HKer=exp(-pow(x, 2)); // uses the identity H_n(x) == (-1)^n exp(x^2) (d/dx)^n exp(-x^2) return normal(pow(-1, n) * diff(HKer, x, n) / HKer); } int main() { try { symbol x("x"); ex myexpr = HermitePoly(x,2); ; FUNCP_1P fp; compile_ex(myexpr, x, fp); cout << fp(1) << endl; } catch(exception &p){ cerr << p.what() << endl; } return 0; } NOTES: 1) The code compiles but the attempt to execute it gives this error: excompiler::link_so_file: could not open compiled module! 2) I'm not sure that my installation of GiNaC went right. I'm not very skilled with software installation and I did it in my home directory using the prefix configuration option. All examples tested thus far have worked correctly except for this one. 3) I'm not sure about the relationship to the error I'm getting but I'll mention this anyway: The doc/examples directory does not have any of the compile[123].cpp examples mentioned in ginac-examples.pdf. It has instead the archive1.cpp example. I'll appreciate your help in fixing this problem. Thanks! Marian Anghel