Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: cpkg-0.2.5.6 (user goal)
[__1] next goal: libarchive (dependency of cpkg)
[__1] rejecting: libarchive-2.2.5.0 (conflict: pkg-config package
libarchive(==3.4.0 || >3.4.0) && <4.0, not found in the pkg-config database)
[__1] rejecting: libarchive-2.2.4.0 (conflict: cpkg => libarchive>=2.2.5.0)
[__1] skipping: libarchive-2.2.3.0, libarchive-2.2.2.0, libarchive-2.2.1.0,
libarchive-2.2.0.2, libarchive-2.2.0.1, libarchive-2.2.0.0,
libarchive-2.1.3.2, libarchive-2.1.3.1, libarchive-2.1.2.1,
libarchive-1.0.3.0, libarchive-1.0.2.0, libarchive-1.0.1.0,
libarchive-1.0.0.0, libarchive-0.2.1.2, libarchive-0.2.1.1,
libarchive-2.1.3.0, libarchive-2.1.2.0, libarchive-2.1.1.0,
libarchive-2.1.0.1, libarchive-2.1.0.0, libarchive-2.0.0.2,
libarchive-2.0.0.1, libarchive-2.0.0.0, libarchive-1.0.5.1,
libarchive-1.0.5.0, libarchive-1.0.4.0, libarchive-0.2.1.0,
libarchive-0.2.0.0, libarchive-0.1.0.0 (has the same characteristics that
caused the previous version to fail: excluded by constraint '>=2.2.5.0' from
'cpkg')
[__1] fail (backjumping, conflict set: cpkg, libarchive)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: cpkg, libarchive