Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: gi-gstpbutils (user goal)
rejecting: gi-gstpbutils-1.0.15 (conflict: requires pkg-config package
gstreamer-pbutils-1.0-any, not found in the pkg-config database)
rejecting: gi-gstpbutils-1.0.14, gi-gstpbutils-1.0.13, gi-gstpbutils-1.0.12
(constraint from user target requires ==1.0.15)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: gi-gstpbutils