The latest ddcutil release (1.1.0) that's about to go into sid increments the shared library to libddcutil.so.4. I've reviewed the code in file e_system_ddc.c. There are no changes that affect your use of the API. All you need to do is check for libddcutil.so.4 before libddcutil.so.3 and libddcutil.so.2. Regards, Sanford Rockowitz ddcutil developer