Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: hercules-ci-cnix-store (user goal)
[__0] rejecting: hercules-ci-cnix-store-0.2.1.2 (conflict: pkg-config package
nix-main(==2.3 || >2.3) && <2.8, not found in the pkg-config database)
[__0] rejecting: hercules-ci-cnix-store-0.2.1.1,
hercules-ci-cnix-store-0.2.1.0, hercules-ci-cnix-store-0.2.0.1,
hercules-ci-cnix-store-0.2.0.0, hercules-ci-cnix-store-0.1.1.0,
hercules-ci-cnix-store-0.1.0.0 (constraint from user target requires
==0.2.1.2)
[__0] fail (backjumping, conflict set: hercules-ci-cnix-store)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: hercules-ci-cnix-store