Resolving dependencies... Configuring data-default-class-0.1.2.0... Configuring dlist-0.8.0.4... Building data-default-class-0.1.2.0... Building dlist-0.8.0.4... Installed data-default-class-0.1.2.0 Configuring ghc-tcplugins-extra-0.3... Building ghc-tcplugins-extra-0.3... Installed dlist-0.8.0.4 Configuring loop-0.3.0... Building loop-0.3.0... Installed loop-0.3.0 Configuring old-locale-1.0.0.7... Installed ghc-tcplugins-extra-0.3 Configuring primitive-0.6.4.0... Building old-locale-1.0.0.7... Building primitive-0.6.4.0... Installed old-locale-1.0.0.7 Configuring random-1.1... Building random-1.1... Installed random-1.1 Configuring semigroups-0.18.5... Building semigroups-0.18.5... Installed semigroups-0.18.5 Configuring data-default-instances-containers-0.0.1... Building data-default-instances-containers-0.0.1... Installed data-default-instances-containers-0.0.1 Configuring data-default-instances-dlist-0.0.1... Building data-default-instances-dlist-0.0.1... Installed data-default-instances-dlist-0.0.1 Configuring ghc-typelits-natnormalise-0.6.2... Building ghc-typelits-natnormalise-0.6.2... Installed primitive-0.6.4.0 Configuring data-default-instances-old-locale-0.0.1... Building data-default-instances-old-locale-0.0.1... Installed data-default-instances-old-locale-0.0.1 Configuring combinat-0.2.8.2... Building combinat-0.2.8.2... Installed ghc-typelits-natnormalise-0.6.2 Configuring HaskellForMaths-0.4.8... Failed to install combinat-0.2.8.2 Build log ( /home/builder/.cabal/logs/ghc-8.4.3/combinat-0.2.8.2-JBg8bCyaKZ4gsZicvGYZo.log ): cabal: Entering directory '/tmp/cabal-tmp-25492/combinat-0.2.8.2' Configuring combinat-0.2.8.2... Preprocessing library for combinat-0.2.8.2.. Building library for combinat-0.2.8.2.. [ 1 of 37] Compiling Math.Combinat.Classes ( Math/Combinat/Classes.hs, dist/build/Math/Combinat/Classes.o ) [ 2 of 37] Compiling Math.Combinat.Helper ( Math/Combinat/Helper.hs, dist/build/Math/Combinat/Helper.o ) [ 3 of 37] Compiling Math.Combinat.ASCII ( Math/Combinat/ASCII.hs, dist/build/Math/Combinat/ASCII.o ) [ 4 of 37] Compiling Math.Combinat.Numbers.Primes ( Math/Combinat/Numbers/Primes.hs, dist/build/Math/Combinat/Numbers/Primes.o ) [ 5 of 37] Compiling Math.Combinat.Partitions.Vector ( Math/Combinat/Partitions/Vector.hs, dist/build/Math/Combinat/Partitions/Vector.o ) [ 6 of 37] Compiling Math.Combinat.Partitions.Multiset ( Math/Combinat/Partitions/Multiset.hs, dist/build/Math/Combinat/Partitions/Multiset.o ) [ 7 of 37] Compiling Math.Combinat.Sign ( Math/Combinat/Sign.hs, dist/build/Math/Combinat/Sign.o ) Math/Combinat/Sign.hs:19:10: error: • No instance for (Semigroup Sign) arising from the superclasses of an instance declaration • In the instance declaration for ‘Monoid Sign’ | 19 | instance Monoid Sign where | ^^^^^^^^^^^ cabal: Leaving directory '/tmp/cabal-tmp-25492/combinat-0.2.8.2' Configuring vector-0.12.0.1... Building HaskellForMaths-0.4.8... Building vector-0.12.0.1... Installed vector-0.12.0.1 Installed HaskellForMaths-0.4.8 cabal: Error: some packages failed to install: combinat-0.2.8.2-JBg8bCyaKZ4gsZicvGYZo failed during the building phase. The exception was: ExitFailure 1 linear-code-0.1.0-EBhjOOcRBzE9keB43jShkn depends on linear-code-0.1.0 which failed to install.