Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: NaCl-0.0.5.0 (user goal)
[__1] next goal: libsodium (dependency of NaCl)
[__1] rejecting: libsodium-1.0.18.2, libsodium-1.0.18.1, libsodium-1.0.18.0
(conflict: pkg-config package libsodium==1.0.18, not found in the pkg-config
database)
[__1] fail (backjumping, conflict set: NaCl, libsodium)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: libsodium, NaCl