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Making a C++ program with the Giac library

Getting libraries to compile giac The source code of giac has an examples/demo folder, where you will find a test program named pgcd.cc that you should be able to compile (g++ pgcd.cc -lgiac -lgmp) once all headers are correctly installed.
Now look at the info documentation of Giac for data structures (like the gen type), etc.

Compiling Giac from source