Warning: The install command is a part of the legacy v1 style of cabal usage.

Please switch to using either the new project style and the new-install
command or the legacy v1-install alias as new-style projects will become the
default in the next version of cabal-install. Please file a bug if you cannot
replicate a working v1- use case with the new-style commands.

For more information, see: https://wiki.haskell.org/Cabal/NewBuild

Resolving dependencies...
Starting     base-orphans-0.8
Starting     colour-2.3.4
Starting     dlist-0.8.0.5
Starting     base-compat-0.10.5
Building     base-orphans-0.8
Building     colour-2.3.4
Building     dlist-0.8.0.5
Building     base-compat-0.10.5
Completed    base-orphans-0.8
Starting     erf-2.0.0.0
Building     erf-2.0.0.0
Completed    dlist-0.8.0.5
Starting     hashable-1.2.7.0
Building     hashable-1.2.7.0
Completed    erf-2.0.0.0
Starting     haskell-lexer-1.0.2
Building     haskell-lexer-1.0.2
Completed    base-compat-0.10.5
Starting     integer-logarithms-1.0.2.2
Building     integer-logarithms-1.0.2.2
Completed    colour-2.3.4
Downloading  loop-0.3.0
Downloaded   loop-0.3.0
Starting     loop-0.3.0
Completed    hashable-1.2.7.0
Starting     newtype-generics-0.5.3
Building     loop-0.3.0
Building     newtype-generics-0.5.3
Completed    integer-logarithms-1.0.2.2
Starting     primitive-0.6.4.0
Completed    loop-0.3.0
Starting     random-1.1
Building     primitive-0.6.4.0
Completed    newtype-generics-0.5.3
Starting     semigroups-0.18.5
Building     random-1.1
Building     semigroups-0.18.5
Completed    semigroups-0.18.5
Downloading  sop-core-0.4.0.0
Downloaded   sop-core-0.4.0.0
Starting     sop-core-0.4.0.0
Building     sop-core-0.4.0.0
Completed    random-1.1
Starting     split-0.2.3.3
Building     split-0.2.3.3
Completed    split-0.2.3.3
Starting     tagged-0.8.6
Building     tagged-0.8.6
Completed    sop-core-0.4.0.0
Starting     th-abstraction-0.2.10.0
Completed    tagged-0.8.6
Starting     time-locale-compat-0.1.1.5
Building     th-abstraction-0.2.10.0
Building     time-locale-compat-0.1.1.5
Completed    time-locale-compat-0.1.1.5
Starting     transformers-compat-0.6.2
Building     transformers-compat-0.6.2
Completed    primitive-0.6.4.0
Starting     unliftio-core-0.1.2.0
Completed    haskell-lexer-1.0.2
Starting     ansi-terminal-0.8.2
Building     unliftio-core-0.1.2.0
Building     ansi-terminal-0.8.2
Completed    th-abstraction-0.2.10.0
Starting     unordered-containers-0.2.9.0
Completed    unliftio-core-0.1.2.0
Starting     async-2.2.1
Building     unordered-containers-0.2.9.0
Completed    transformers-compat-0.6.2
Downloading  MemoTrie-0.6.9
Downloaded   MemoTrie-0.6.9
Starting     MemoTrie-0.6.9
Building     async-2.2.1
Building     MemoTrie-0.6.9
Completed    ansi-terminal-0.8.2
Starting     uuid-types-1.0.3
Building     uuid-types-1.0.3
Completed    async-2.2.1
Downloading  generics-sop-0.4.0.1
Downloaded   generics-sop-0.4.0.1
Starting     generics-sop-0.4.0.1
Completed    MemoTrie-0.6.9
Starting     vector-0.12.0.2
Building     generics-sop-0.4.0.1
Building     vector-0.12.0.2
Completed    uuid-types-1.0.3
Starting     tf-random-0.5
Building     tf-random-0.5
Completed    unordered-containers-0.2.9.0
Starting     scientific-0.3.6.2
Building     scientific-0.3.6.2
Completed    tf-random-0.5
Downloading  pretty-show-1.9.5
Downloaded   pretty-show-1.9.5
Starting     pretty-show-1.9.5
Failed to install pretty-show-1.9.5
Build log ( /home/builder/.cabal/logs/ghc-8.6.3/pretty-show-1.9.5-4s9IVBWSe01IF3L4DDRCg8.log ):
cabal: Entering directory '/tmp/cabal-tmp-15662/pretty-show-1.9.5'
Configuring pretty-show-1.9.5...
cabal: The program 'happy' is required but it could not be found.

cabal: Leaving directory '/tmp/cabal-tmp-15662/pretty-show-1.9.5'
Starting     exceptions-0.10.0
Building     exceptions-0.10.0
Completed    scientific-0.3.6.2
Completed    exceptions-0.10.0
Completed    vector-0.12.0.2
Completed    generics-sop-0.4.0.1
cabal: Error: some packages failed to install:
pretty-show-1.9.5-4s9IVBWSe01IF3L4DDRCg8 failed during the configure step. The
exception was:
ExitFailure 1
quickcheck-state-machine-0.5.0-EvtR9eyRN0z9VDBEE7rFU depends on
quickcheck-state-machine-0.5.0 which failed to install.