Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: greenclip (user goal)
[__0] rejecting: greenclip-4.1.0 (conflict: pkg-config package xscrnsaver-any,
not found in the pkg-config database)
[__0] rejecting: greenclip-3.4.0, greenclip-3.3.0, greenclip-3.2.0,
greenclip-3.1.1, greenclip-3.1.0, greenclip-3.0.2, greenclip-3.0.1,
greenclip-3.0.0, greenclip-2.0.1, greenclip-2.0.0, greenclip-1.3.0 (constraint
from user target requires ==4.1.0)
[__0] fail (backjumping, conflict set: greenclip)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: greenclip