This is the "home" of external libraries that are used in Bareos
Each Library will be put into its own subdirectory with git subtree and will have its own CMake include-file (if it is not already made available by the provider of the library), that is then loaded in CMakeLists.txt
A typical git subtree command would look like this : git subtree add --prefix destination/path https://www.yourgithost.com/your/repo yourbranch(usuallymaster) --squash
Make sure the library license is covert by core/LICENSE. At best, the library is also licensed as AGPL-3. If it is not already covered, a section needs to be added for it in core/LICENSE and debian/copyright.footer. Also execute cd debian; make copyright to update debian/copyright.
External things that we rely on (but don't want to change) should live here. Things like FMT and GSL could be added here.
lmdb (and maybe the md5 code) should be migrated here.
Things like droplet, fastlz and ndmp will stay as is, because there is no upstream and we made significant changes (i.e. we imported that code into our code-base instead of just using it).