Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: ghc-vis-0.9.2 (user goal)
[__1] next goal: svgcairo (dependency of ghc-vis)
[__1] rejecting: svgcairo-0.13.2.1, svgcairo-0.13.2.0, svgcairo-0.13.1.1,
svgcairo-0.13.1.0, svgcairo-0.13.0.4, svgcairo-0.13.0.3, svgcairo-0.13.0.2,
svgcairo-0.13.0.1, svgcairo-0.13.0.0, svgcairo-0.12.5.2, svgcairo-0.12.5.1,
svgcairo-0.12.5.0, svgcairo-0.12.1.1, svgcairo-0.12.1 (conflict: pkg-config
package librsvg-2.0==2.16.0 || >2.16.0, not found in the pkg-config database)
[__1] rejecting: svgcairo-0.12.0 (conflict: pkg-config package
cairo-svg==1.6.0 || >1.6.0, not found in the pkg-config database)
[__1] rejecting: svgcairo-0.11.1 (conflict: ghc-vis => svgcairo>=0.12)
[__1] skipping: svgcairo-0.11.0 (has the same characteristics that caused the
previous version to fail: excluded by constraint '>=0.12' from 'ghc-vis')
[__1] fail (backjumping, conflict set: ghc-vis, svgcairo)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: svgcairo, ghc-vis