This directory is used to download and build dependencies for BOINC components. Archives should be downloaded into a platform specific subdirectory (e.g linux, mac, ...) to allow cross compilation of several platforms on a single host.
Build products of dependencies should be installed into a corresponding subdirectory of 3rdParty/buildCache to allow CI systems to cache this data between BOINC builds.
See the existing buildLinuxDependencies.sh and buildMacDependencies.sh scripts for how this is done on Linux and Mac currently.