Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: libsodium (user goal)
[__0] rejecting: libsodium-1.0.18.2 (conflict: pkg-config package
libsodium==1.0.18, not found in the pkg-config database)
[__0] rejecting: libsodium-1.0.18.1, libsodium-1.0.18.0 (constraint from user
target requires ==1.0.18.2)
[__0] fail (backjumping, conflict set: libsodium)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: libsodium