Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: differential-0.2.0.1 (user goal)
[__1] next goal: inline-r (dependency of differential)
[__1] rejecting: inline-r-0.10.4, inline-r-0.10.3, inline-r-0.10.2,
inline-r-0.10.1, inline-r-0.10, inline-r-0.9.2, inline-r-0.9.1,
inline-r-0.9.0.2, inline-r-0.9.0.1, inline-r-0.9.0.0, inline-r-0.8.0.1,
inline-r-0.8.0.0, inline-r-0.7.3.0, inline-r-0.7.2.0, inline-r-0.7.1.2,
inline-r-0.7.1.1, inline-r-0.7.1.0, inline-r-0.7.0.0 (conflict: pkg-config
package libR==3.0 || >3.0, not found in the pkg-config database)
[__1] fail (backjumping, conflict set: differential, inline-r)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: inline-r, base, differential