Resolving dependencies... Configuring network-2.6.3.1... Configuring mtl-2.2.1... Building mtl-2.2.1... Building network-2.6.3.1... Installed mtl-2.2.1 Configuring nixos-types-1.5... Building nixos-types-1.5... Configuring tar-0.5.0.3... Installed nixos-types-1.5 Building tar-0.5.0.3... Configuring utf8-string-1.0.1.1... Installed network-2.6.3.1 Building utf8-string-1.0.1.1... Configuring text-1.2.2.1... Installed tar-0.5.0.3 Building text-1.2.2.1... Configuring regex-base-0.93.2... Installed utf8-string-1.0.1.1 Building regex-base-0.93.2... Configuring hackage-db-1.22... Installed regex-base-0.93.2 Building hackage-db-1.22... Installed hackage-db-1.22 Configuring regex-posix-0.95.2... Building regex-posix-0.95.2... Installed regex-posix-0.95.2 Installed text-1.2.2.1 Configuring parsec-3.1.11... Building parsec-3.1.11... Installed parsec-3.1.11 Configuring network-uri-2.6.1.0... Building network-uri-2.6.1.0... Installed network-uri-2.6.1.0 Configuring HTTP-4000.3.3... Building HTTP-4000.3.3... Installed HTTP-4000.3.3 Configuring cabal2nix-1.21... Building cabal2nix-1.21... Failed to install cabal2nix-1.21 Build log ( /home/builder/.cabal/logs/cabal2nix-1.21.log ): cabal: Entering directory '/tmp/cabal-tmp-17655/cabal2nix-1.21' Configuring cabal2nix-1.21... Building cabal2nix-1.21... Preprocessing executable 'cabal2nix' for cabal2nix-1.21... [1 of 9] Compiling Cabal2Nix.PostProcess ( src/Cabal2Nix/PostProcess.hs, dist/build/cabal2nix/cabal2nix-tmp/Cabal2Nix/PostProcess.o ) src/Cabal2Nix/PostProcess.hs:5:1: error: Failed to load interface for ‘Distribution.NixOS.Derivation.Cabal’ Use -v to see a list of the files searched for. cabal: Leaving directory '/tmp/cabal-tmp-17655/cabal2nix-1.21' cabal: Error: some packages failed to install: cabal2nix-1.21 failed during the building phase. The exception was: ExitFailure 1