Looking at our net/tdesktop and github.com/desktop-app/cmake_helpers which is telegram's code handling libdispatch, I'm sure it would pick it up.
Right now, it tries to find system dispatch, fails, tries to build the bundled version, fails again since we intentionally zapped the bundle and eventually tdesktop still builds/runs fine... I vaguely remember upstream introducing libdispatch as dependency and Andrew and me trying to disable/neuter it, but I plain forgot how we arrived at the current status quo.
