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