Currently Bazel uses Conan for managing dependencies, which downloads, builds from source and installs packages. The problem is that building dependencies from sources requires a lot of time and system resources (i. e. building Boost libraries on VM once required up to 4 GB of RAM from me), and not every user is able to build all these libraries themselves. It would be great if Bazel could use dependencies installed by the user from the system package manager. For Debian GNU/Linux, it could be libboost-dev, libre2-dev, etc. Unfortunately, Bazel documentation is not clear enough about using external dependencies.