CMake - linking to library downloaded from ExternalProject_add()

Question

I am trying to use ExternalProject_add() to download/install dependencies. It installs fine, but I can\'t figure out how to actually link the libraries after they are downlo

Answer 1

Another idiom you can use to solve this problem:

1. Make your find_package commands optional (remove 'REQUIRED')
2. Add some condition code to only build your targets if find_package succeeds.
3. find_package will fail and your targets won't be built the first time around, but the External Projects will be built.
4. Run cmake/make again, this time find_package will succeed and your targets will be built.

You can see this idiom in action in https://github.com/biometrics/likely.