Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: Bookshelf (user goal)
rejecting: Bookshelf-0.5, 0.4, 0.3.1, 0.3, 0.2 (global constraint requires
==0.1.6)
trying: Bookshelf-0.1.6
trying: pandoc-types-1.12.4.7 (dependency of Bookshelf-0.1.6)
trying: aeson-0.10.0.0 (dependency of pandoc-types-1.12.4.7)
trying: text-1.2.1.3 (dependency of aeson-0.10.0.0)
trying: binary-0.7.5.0/installed-072... (dependency of text-1.2.1.3)
trying: mtl-2.2.1 (dependency of aeson-0.10.0.0)
trying: syb-0.6 (dependency of pandoc-types-1.12.4.7)
next goal: pandoc (dependency of Bookshelf-0.1.6)
rejecting: pandoc-1.15.0.6, 1.15.0.5, 1.15.0.4, 1.15.0.3, 1.15.0.2, 1.14.1
(conflict: syb==0.6, pandoc => syb>=0.1 && <0.6)
rejecting: pandoc-1.13.2.1, 1.13.2, 1.13.1, 1.13.0.1, 1.13, 1.12.4.2, 1.12.4,
1.12.3.3, 1.12.3.2, 1.12.3.1, 1.12.3, 1.12.2.1, 1.12.2, 1.12.1, 1.12.0.2,
1.12.0.1, 1.12, 1.11.1, 1.11 (conflict: syb==0.6, pandoc => syb>=0.1 && <0.5)
rejecting: pandoc-1.10.1, 1.10.0.5, 1.10.0.4, 1.10.0.3, 1.10.0.2, 1.10.0.1,
1.10 (conflict: syb==0.6, pandoc => syb>=0.1 && <0.4)
rejecting: pandoc-1.9.4.5, 1.9.4.4, 1.9.4.3 (conflict: mtl==2.2.1, pandoc =>
mtl>=1.1 && <2.2)
rejecting: pandoc-1.9.4.2, 1.9.4.1, 1.9.4, 1.9.3, 1.9.2, 1.9.1.2, 1.9.1.1,
1.9.1, 1.9.0.5, 1.9.0.4, 1.9.0.3, 1.9.0.2, 1.9, 1.8.2.1, 1.8.2, 1.8.1.2,
1.8.1.1, 1.8.1, 1.8.0.3, 1.8.0.2, 1.8.0.1, 1.8 (conflict: binary =>
containers==0.5.6.2/installed-2de..., pandoc => containers>=0.1 && <0.5)
rejecting: pandoc-1.6.0.1, 1.6, 1.5.1.1, 1.5.1, 1.5.0.1, 1.5, 1.4, 1.3, 1.2.1,
1.2, 1.1, 1.0.0.1, 1.0, 0.46, 0.45, 0.44, 0.43, 0.42, 0.41, 0.4 (conflict:
Bookshelf => pandoc>=1.8)
rejecting: pandoc-1.15.0.1, 1.15, 1.14.0.4, 1.14.0.3 (conflict: syb==0.6,
pandoc => syb>=0.1 && <0.6)
rejecting: pandoc-1.14.0.2, 1.14.0.1, 1.14 (conflict: syb==0.6, pandoc =>
syb>=0.1 && <0.5)
Backjump limit reached (change with --max-backjumps).