Am running Mint 17.3 (based on Trusty). When I run: sudo apt-get install libpurple-dev libjson-glib-dev libglib2.0-dev libprotobuf-c-dev protobuf-c-compiler mercurial make It returns: E: Unable to locate package libprotobuf-c-dev ...
but had to make sure no more recent version of Protobuf was installed locally on my PC. For cross-compiling the ONNX runtime 1.11.0 this was however not needed. I think they messed up a bit their CMake build environment, they made some changes in that external deps folder. ...