Nix-darwin: package is not available on the requested hostPlatform

I have no idea what’s causing the error / why my darwin build is trying to get libdrm. --show-trace output: error: … while calling the 'derivationStrict' builtin at «nix-internal»/derivation-internal.nix:37:12: 36| 37| strict = derivationStrict drvAttrs; | ^ 38| … while evaluating derivation 'darwin-system-26.11.15abb8c' whose name attribute is located at «github:N...