Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: wai-saml2-0.2.1.0 (user goal)
[__1] next goal: c14n (dependency of wai-saml2)
[__1] rejecting: c14n-0.1.0.1 (conflict: pkg-config package libxml-2.0-any,
not found in the pkg-config database)
[__1] rejecting: c14n-0.1.0.0 (conflict: wai-saml2 => c14n>=0.1.0.1 && <1)
[__1] fail (backjumping, conflict set: c14n, wai-saml2)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: wai-saml2, c14n