Dear user, we never tested Clion so far. We always relied on qtcreator as IDE. Please take a look at this link to have more information on how to configure ns-3 with qtcreator.
Anyway, to build and run the project you don't have to necessarily install and configure an IDE: after you launched the script "sandbox_builder.sh" you can directly go on the main ns-3.33 folder, then launch:
./waf configure --build-profile=optimized --enable-examples
and after that:
./waf build
Dear user, we never tested Clion so far. We always relied on qtcreator as IDE. Please take a look at this link to have more information on how to configure ns-3 with qtcreator. Anyway, to build and run the project you don't have to necessarily install and configure an IDE: after you launched the script "sandbox_builder.sh" you can directly go on the main ns-3.33 folder, then launch: ./waf configure --build-profile=optimized --enable-examples and after that: ./waf build