Output path comparison

error: while evaluating anonymous function at /var/lib/gc-of-borg/.nix-test-rs/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/grahamc-zoidberg/.gc-of-borg-outpaths.nix:35:12, called from /var/lib/gc-of-borg/.nix-test-rs/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/grahamc-zoidberg/lib/attrsets.nix:199:52:
while evaluating the attribute ‘i686-linux’ at /var/lib/gc-of-borg/.nix-test-rs/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/grahamc-zoidberg/lib/attrsets.nix:185:41:
while evaluating anonymous function at /var/lib/gc-of-borg/.nix-test-rs/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/grahamc-zoidberg/pkgs/top-level/release-lib.nix:66:6, called from /var/lib/gc-of-borg/.nix-test-rs/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/grahamc-zoidberg/lib/attrsets.nix:282:43:
while evaluating ‘hydraJob’ at /var/lib/gc-of-borg/.nix-test-rs/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/grahamc-zoidberg/lib/customisation.nix:157:14, called from /var/lib/gc-of-borg/.nix-test-rs/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/grahamc-zoidberg/pkgs/top-level/release-lib.nix:66:14:
while evaluating the attribute ‘drvPath’ at /var/lib/gc-of-borg/.nix-test-rs/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/grahamc-zoidberg/lib/customisation.nix:174:13:
while evaluating the attribute ‘drvPath’ at /var/lib/gc-of-borg/.nix-test-rs/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/grahamc-zoidberg/lib/customisation.nix:145:40:
while evaluating the attribute ‘buildInputs’ of the derivation ‘scalendar-1.2.0’ at /var/lib/gc-of-borg/.nix-test-rs/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/grahamc-zoidberg/pkgs/stdenv/generic/make-derivation.nix:98:11:
while evaluating the attribute ‘buildInputs’ of the derivation ‘SCalendar-1.1.0’ at /var/lib/gc-of-borg/.nix-test-rs/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/grahamc-zoidberg/pkgs/stdenv/generic/make-derivation.nix:98:11:
infinite recursion encountered, at undefined position