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.

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Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: gi-gdkpixbuf (user goal)
[__0] rejecting: gi-gdkpixbuf-2.0.21 (conflict: pkg-config package
gdk-pixbuf-2.0-any, not found in the pkg-config database)
[__0] rejecting: gi-gdkpixbuf-2.0.20, gi-gdkpixbuf-2.0.19,
gi-gdkpixbuf-2.0.18, gi-gdkpixbuf-2.0.16, gi-gdkpixbuf-2.0.15,
gi-gdkpixbuf-2.0.14, gi-gdkpixbuf-2.0.13, gi-gdkpixbuf-2.0.12,
gi-gdkpixbuf-2.0.11, gi-gdkpixbuf-2.0.10, gi-gdkpixbuf-2.0.9,
gi-gdkpixbuf-2.0.8, gi-gdkpixbuf-2.0.7, gi-gdkpixbuf-2.0.6,
gi-gdkpixbuf-2.0.5, gi-gdkpixbuf-2.0.4, gi-gdkpixbuf-2.0.3,
gi-gdkpixbuf-2.0.2, gi-gdkpixbuf-2.0.1, gi-gdkpixbuf-0.2.32.15,
gi-gdkpixbuf-0.2.32.14, gi-gdkpixbuf-0.2.32.13, gi-gdkpixbuf-0.2.32.12,
gi-gdkpixbuf-0.2.32.10, gi-gdkpixbuf-0.2.31.12, gi-gdkpixbuf-0.2.31.11,
gi-gdkpixbuf-0.2.31.10, gi-gdkpixbuf-0.2.31.9, gi-gdkpixbuf-0.2.31.8
(constraint from user target requires ==2.0.21)
[__0] fail (backjumping, conflict set: gi-gdkpixbuf)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: gi-gdkpixbuf