Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: brillo-export-0.2.0.0 (user goal)
[__1] next goal: webp (dependency of brillo-export)
[__1] rejecting: webp-0.1.2.0, webp-0.1.1.0, webp-0.1.0.3, webp-0.1.0.2,
webp-0.1.0.1, webp-0.1.0.0 (conflict: pkg-config package libwebp>=0.6.1, not
found in the pkg-config database)
[__1] fail (backjumping, conflict set: brillo-export, webp)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: webp, brillo-export