Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: aivika-experiment-cairo-5.4.1 (user goal)
[__1] trying: base-4.16.3.0/installed-4.16.3.0 (dependency of
aivika-experiment-cairo)
[__2] trying: Chart-cairo-1.9.3 (dependency of aivika-experiment-cairo)
[__3] next goal: cairo (dependency of Chart-cairo)
[__3] rejecting: cairo-0.13.10.0, cairo-0.13.8.2, cairo-0.13.8.1,
cairo-0.13.8.0, cairo-0.13.6.1, cairo-0.13.6.0, cairo-0.13.5.0,
cairo-0.13.4.2, cairo-0.13.4.1, cairo-0.13.4.0, cairo-0.13.3.1,
cairo-0.13.3.0, cairo-0.13.2.0, cairo-0.13.1.1, cairo-0.13.1.0,
cairo-0.13.0.6, cairo-0.13.0.5, cairo-0.13.0.4, cairo-0.13.0.3,
cairo-0.13.0.2, cairo-0.13.0.1, cairo-0.13.0.0 (conflict: pkg-config package
cairo>=1.2.0, not found in the pkg-config database)
[__3] rejecting: cairo-0.12.5.3 (conflict: base==4.16.3.0/installed-4.16.3.0,
cairo => base>=4 && <4.7)
[__3] skipping: cairo-0.12.5.1, cairo-0.12.5.0, cairo-0.12.4, cairo-0.12.3.1,
cairo-0.12.3, cairo-0.12.2, cairo-0.12.1, cairo-0.12.0, cairo-0.11.1,
cairo-0.11.0 (has the same characteristics that caused the previous version to
fail: excludes 'base' version 4.16.3.0)
[__3] fail (backjumping, conflict set: Chart-cairo, base, cairo)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: cairo, base, Chart-cairo,
aivika-experiment-cairo
Try running with --minimize-conflict-set to improve the error message.