Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: music-sibelius (user goal)
rejecting: music-sibelius-1.9.0, 1.8.1, 1.8, 1.7.2, 1.7.1, 1.7, 1.6.2, 1.6.1
(global constraint requires ==1.6)
trying: music-sibelius-1.6
next goal: music-preludes (dependency of music-sibelius-1.6)
rejecting: music-preludes-1.9.0, 1.8.1, 1.8, 1.7.2, 1.7.1, 1.7, 1.6.2, 1.6.1
(conflict: music-sibelius => music-preludes==1.6)
trying: music-preludes-1.6
trying: lens-4.13 (dependency of music-preludes-1.6)
next goal: music-score (dependency of music-sibelius-1.6)
rejecting: music-score-1.9.0, 1.8.1, 1.8, 1.7.2, 1.7.1, 1.7, 1.6.2, 1.6.1
(conflict: music-sibelius => music-score==1.6)
rejecting: music-score-1.6 (conflict: lens==4.13, music-score => lens>=4.0 &&
<4.1)
rejecting: music-score-1.3.1, 1.3, 1.2.2, 1.2.1, 1.2 (conflict: music-sibelius
=> music-score==1.6)
Backjump limit reached (change with --max-backjumps).