Warning: The install command is a part of the legacy v1 style of cabal usage. Please switch to using either the new project style and the new-install command or the legacy v1-install alias as new-style projects will become the default in the next version of cabal-install. Please file a bug if you cannot replicate a working v1- use case with the new-style commands. For more information, see: https://wiki.haskell.org/Cabal/NewBuild Resolving dependencies... cabal: Could not resolve dependencies: [__0] trying: threadscope-0.2.13 (user goal) [__1] next goal: pango (dependency of threadscope) [__1] rejecting: pango-0.13.8.0, pango-0.13.6.1, pango-0.13.6.0, pango-0.13.5.0, pango-0.13.4.0, pango-0.13.3.1, pango-0.13.3.0, pango-0.13.2.0, pango-0.13.1.1, pango-0.13.1.0, pango-0.13.0.5, pango-0.13.0.4, pango-0.13.0.3, pango-0.13.0.2, pango-0.13.0.1, pango-0.13.0.0, pango-0.12.5.3, pango-0.12.5.0, pango-0.12.4, pango-0.12.3, pango-0.12.2, pango-0.12.1, pango-0.12.0, pango-0.11.2, pango-0.11.1, pango-0.11.0 (conflict: pkg-config package pango>=1.0, not found in the pkg-config database) [__1] fail (backjumping, conflict set: pango, threadscope) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: pango, threadscope