Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] next goal: hpqtypes (user goal)
[__0] rejecting: hpqtypes-1.13.0.1 (conflict: pkg-config package libpq-any,
not found in the pkg-config database)
[__0] rejecting: hpqtypes-1.13.0.0, hpqtypes-1.12.0.0, hpqtypes-1.11.1.2,
hpqtypes-1.11.1.1, hpqtypes-1.11.1.0, hpqtypes-1.11.0.0, hpqtypes-1.10.0.2,
hpqtypes-1.10.0.1, hpqtypes-1.10.0.0, hpqtypes-1.9.4.0, hpqtypes-1.9.3.1,
hpqtypes-1.9.3.0, hpqtypes-1.9.2.1, hpqtypes-1.9.2.0, hpqtypes-1.9.1.2,
hpqtypes-1.9.1.1, hpqtypes-1.9.1.0, hpqtypes-1.9.0.1, hpqtypes-1.9.0.0,
hpqtypes-1.8.0.1, hpqtypes-1.8.0.0, hpqtypes-1.7.0.0, hpqtypes-1.6.1.0,
hpqtypes-1.6.0.0, hpqtypes-1.5.3.0, hpqtypes-1.5.2.0, hpqtypes-1.5.1.1,
hpqtypes-1.5.1, hpqtypes-1.5.0, hpqtypes-1.4.4, hpqtypes-1.4.3,
hpqtypes-1.4.2, hpqtypes-1.4.1, hpqtypes-1.4.0, hpqtypes-1.3.2,
hpqtypes-1.3.0, hpqtypes-1.2.5, hpqtypes-1.2.4, hpqtypes-1.2.3,
hpqtypes-1.2.2, hpqtypes-1.3.1 (constraint from user target requires
==1.13.0.1)
[__0] fail (backjumping, conflict set: hpqtypes)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: hpqtypes