Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: scan-vector-machine (user goal)
rejecting: scan-vector-machine-0.2.7, scan-vector-machine-0.2.6,
scan-vector-machine-0.2.5 (constraint from user target requires ==0.2.4)
trying: scan-vector-machine-0.2.4
trying: base-4.9.0.0/installed-4.9... (dependency of
scan-vector-machine-0.2.4)
next goal: dph-base (dependency of scan-vector-machine-0.2.4)
rejecting: dph-base-0.7.0.1 (conflict: base==4.9.0.0/installed-4.9...,
dph-base => base==4.6.*)
rejecting: dph-base-0.6.1.1, dph-base-0.6.0.1 (conflict:
base==4.9.0.0/installed-4.9..., dph-base => base==4.5.*)
rejecting: dph-base-0.5.1.1 (conflict: base==4.9.0.0/installed-4.9...,
dph-base => base==4.4.*)
Dependency tree exhaustively searched.