Resolving dependencies... cabal: Could not resolve dependencies: next goal: hprotoc (user goal) rejecting: hprotoc-2.1.7, 2.1.6, 2.1.5, 2.1.4, 2.1.3, 2.1.2, 2.1.0, 2.0.17, 2.0.15, 2.0.14, 2.0.13, 2.0.12, 2.0.11, 2.0.10, 2.0.9 (global constraint requires ==2.0.7) trying: hprotoc-2.0.7 trying: base-4.8.1.0/installed-4f7... (dependency of hprotoc-2.0.7) next goal: protocol-buffers (dependency of hprotoc-2.0.7) rejecting: protocol-buffers-2.1.7, 2.1.6, 2.1.5, 2.1.4, 2.1.3, 2.1.2, 2.1.1, 2.1.0, 2.0.17, 2.0.14, 2.0.12, 2.0.11, 2.0.10, 2.0.9, 2.0.8 (conflict: hprotoc => protocol-buffers==2.0.7) trying: protocol-buffers-2.0.7 rejecting: protocol-buffers-2.0.7:+small_base (conflict: base==4.8.1.0/installed-4f7..., protocol-buffers-2.0.7:small_base => base>=4.5 && <4.7) rejecting: protocol-buffers-2.0.7:-small_base (conflict: base==4.8.1.0/installed-4f7..., protocol-buffers-2.0.7:small_base => base==3.*) Dependency tree exhaustively searched.