Resolving dependencies... cabal: Could not resolve dependencies: trying: base-4.9.0.0/installed-4.9... (dependency of boomslang-0.0.4) next goal: OpenGL (dependency of boomslang-0.0.4) rejecting: OpenGL-3.0.1.0, OpenGL-3.0.0.2, OpenGL-3.0.0.1, OpenGL-3.0.0.0, OpenGL-2.13.2.1, OpenGL-2.13.2.0, OpenGL-2.13.1.1, OpenGL-2.13.1.0, OpenGL-2.13.0.0, OpenGL-2.12.0.1, OpenGL-2.12.0.0, OpenGL-2.11.1.0, OpenGL-2.11.0.0, OpenGL-2.10.0.2, OpenGL-2.10.0.1, OpenGL-2.10.0.0, OpenGL-2.9.2.0, OpenGL-2.9.1.0, OpenGL-2.9.0.0, OpenGL-2.8.0.0, OpenGL-2.6.0.1, OpenGL-2.6.0.0 (conflict: boomslang => OpenGL==2.5.*) trying: OpenGL-2.5.0.0 next goal: Tensor (dependency of OpenGL-2.5.0.0) rejecting: Tensor-1.1.0.1, Tensor-1.1.0.0 (conflict: OpenGL => Tensor==1.0.*) rejecting: Tensor-1.0.0.1, Tensor-1.0.0.0 (conflict: base==4.9.0.0/installed-4.9..., Tensor => base>=3 && <4.7) Dependency tree exhaustively searched.