Resolving dependencies... cabal: Could not resolve dependencies: [__0] trying: midimory-0.0.2.2 (user goal) [__1] trying: wxcore-0.92.3.0 (dependency of midimory) [__2] trying: wxdirect-0.92.3.0 (dependency of wxcore) [__3] next goal: process (dependency of wxdirect) [__3] rejecting: process-1.6.9.0/installed-1.6.9.0 (conflict: wxdirect => process>=1.1 && <1.5) [__3] skipping: process-1.6.13.2, process-1.6.13.1, process-1.6.12.0, process-1.6.11.0, process-1.6.10.0, process-1.6.9.0, process-1.6.8.2, process-1.6.8.1, process-1.6.8.0, process-1.6.7.0, process-1.6.6.0, process-1.6.5.1, process-1.6.5.0, process-1.6.4.0, process-1.6.3.0, process-1.6.2.0, process-1.6.1.0, process-1.6.0.0, process-1.5.0.0 (has the same characteristics that caused the previous version to fail: excluded by constraint '>=1.1 && <1.5' from 'wxdirect') [__3] trying: process-1.4.3.0 [__4] next goal: directory (dependency of wxcore) [__4] rejecting: directory-1.3.6.0/installed-1.3.6.0 (conflict: process => base>=4.4 && <4.11, directory => base==4.14.1.0/installed-4.14.1.0) [__4] trying: directory-1.3.7.0 [__5] next goal: containers (dependency of midimory) [__5] rejecting: containers-0.6.2.1/installed-0.6.2.1, containers-0.6.5.1, containers-0.6.4.1, containers-0.6.3.1, containers-0.6.2.1, containers-0.6.1.1, containers-0.6.0.1 (conflict: wxcore +/-splitbase => containers>=0.1 && <0.6) [__5] trying: containers-0.5.11.0 [__6] next goal: base (dependency of midimory) [__6] rejecting: base-4.14.1.0/installed-4.14.1.0 (conflict: process => base>=4.4 && <4.11) [__6] skipping: base-4.16.0.0, base-4.15.1.0, base-4.15.0.0, base-4.14.3.0, base-4.14.2.0, base-4.14.1.0, base-4.14.0.0, base-4.13.0.0, base-4.12.0.0, base-4.11.1.0, base-4.11.0.0 (has the same characteristics that caused the previous version to fail: excluded by constraint '>=4.4 && <4.11' from 'process') [__6] rejecting: base-4.10.1.0, base-4.10.0.0, base-4.9.1.0, base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0, base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0, base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0, base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0, base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable package requires installed instance) [__6] fail (backjumping, conflict set: base, midimory, process) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: wxdirect, wxcore, process, directory, base, containers, array, midimory Try running with --minimize-conflict-set to improve the error message.