Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: blakesum (user goal)
rejecting: blakesum-0.5 (global constraint requires ==0.4)
trying: blakesum-0.4
trying: base-4.8.1.0/installed-4f7... (dependency of blakesum-0.4)
next goal: haskell98 (dependency of blakesum-0.4)
rejecting: haskell98-2.0.0.3, 2.0.0.2, 2.0.0.1, 2.0.0.0 (conflict: blakesum =>
haskell98>=1 && <2)
rejecting: haskell98-1.1.0.1, 1.1.0.0, 1.0.1.1 (conflict:
base==4.8.1.0/installed-4f7..., haskell98 => base>=3 && <4.6)
rejecting: haskell98-1.0.1.0 (conflict: base==4.8.1.0/installed-4f7...,
haskell98 => base<4.6)
rejecting: haskell98-1.0 (conflict: base==4.8.1.0/installed-4f7..., haskell98
=> base<4.3)
Dependency tree exhaustively searched.