Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: synthesizer-alsa (user goal)
rejecting: synthesizer-alsa-0.5.0.2, 0.5.0.1, 0.5 (global constraint requires
==0.4)
trying: synthesizer-alsa-0.4
trying: base-4.7.0.1/installed-e4b... (dependency of synthesizer-alsa-0.4)
next goal: array (dependency of synthesizer-alsa-0.4)
rejecting: array-0.5.0.0/installed-98a..., 0.5.1.0, 0.5.0.0, 0.4.0.1, 0.4.0.0
(conflict: synthesizer-alsa => array>=0.1 && <0.4)
rejecting: array-0.3.0.3 (conflict: base==4.7.0.1/installed-e4b..., array =>
base>=4.2 && <4.5)
rejecting: array-0.3.0.2, 0.3.0.1 (conflict: base==4.7.0.1/installed-e4b...,
array => base>=4.2 && <4.4)
rejecting: array-0.3.0.0 (conflict: base==4.7.0.1/installed-e4b..., array =>
base>=3 && <4.4)
rejecting: array-0.2.0.0, 0.1.0.0 (conflict: base==4.7.0.1/installed-e4b...,
array => base<4.3)
Dependency tree exhaustively searched.