Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: biscuit-haskell-0.1.0.0 (user goal)
[__1] next goal: libsodium (dependency of biscuit-haskell)
[__1] rejecting: 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: biscuit-haskell, libsodium)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: biscuit-haskell, libsodium