Earlier quoted context omitted.
> How else would you add library dependencies? Like this? libraryDependencies ++= Seq(...)
Ok, so what's the difference between that and libraryDependencies :++= Seq(...) ? Because I've definitely seen that in some build.sbt files.
This doesn't exist:
error: value :++= is not a member of sbt.TaskKey[Seq[sbt.ModuleID]]