Warning: The install command is a part of the legacy v1 style of cabal usage.

Please switch to using either the new project style and the new-install
command or the legacy v1-install alias as new-style projects will become the
default in the next version of cabal-install. Please file a bug if you cannot
replicate a working v1- use case with the new-style commands.

For more information, see: https://wiki.haskell.org/Cabal/NewBuild

Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: mp-1.1.0 (user goal)
[__1] next goal: gi-gst (dependency of mp)
[__1] rejecting: gi-gst-1.0.16, gi-gst-1.0.15, gi-gst-1.0.14, gi-gst-1.0.13,
gi-gst-1.0.12, gi-gst-1.0.11, gi-gst-1.0.10, gi-gst-1.0.9, gi-gst-1.0.8,
gi-gst-1.0.7, gi-gst-1.0.6, gi-gst-1.0.5, gi-gst-1.0.4, gi-gst-1.0.3,
gi-gst-1.0.2, gi-gst-1.0.1 (conflict: pkg-config package gstreamer-1.0-any,
not found in the pkg-config database)
[__1] rejecting: gi-gst-0.1.6.13 (conflict: mp => gi-gst(>=1.0 && <1.1))
[__1] fail (backjumping, conflict set: gi-gst, mp)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: gi-gst, mp