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     StateVar-1.1.1.1
Starting     appar-0.1.7
Starting     auto-update-0.1.4
Starting     SHA-1.6.4.4
Building     auto-update-0.1.4
Building     StateVar-1.1.1.1
Building     appar-0.1.7
Building     SHA-1.6.4.4
Completed    StateVar-1.1.1.1
Starting     base-compat-0.10.5
Completed    appar-0.1.7
Starting     base-orphans-0.8
Completed    auto-update-0.1.4
Starting     base64-bytestring-1.0.0.2
Building     base-compat-0.10.5
Building     base-orphans-0.8
Building     base64-bytestring-1.0.0.2
Completed    base-orphans-0.8
Starting     basement-0.0.8
Building     basement-0.0.8
Completed    base64-bytestring-1.0.0.2
Starting     blaze-builder-0.4.1.0
Building     blaze-builder-0.4.1.0
Completed    SHA-1.6.4.4
Starting     bsb-http-chunked-0.0.0.4
Building     bsb-http-chunked-0.0.0.4
Completed    base-compat-0.10.5
Starting     byteorder-1.0.4
Building     byteorder-1.0.4
Completed    blaze-builder-0.4.1.0
Starting     bytestring-builder-0.10.8.2.0
Building     bytestring-builder-0.10.8.2.0
Completed    bsb-http-chunked-0.0.0.4
Starting     cabal-doctest-1.0.6
Completed    bytestring-builder-0.10.8.2.0
Starting     call-stack-0.1.0
Completed    byteorder-1.0.4
Starting     cereal-0.5.7.0
Building     cabal-doctest-1.0.6
Building     call-stack-0.1.0
Building     cereal-0.5.7.0
Completed    call-stack-0.1.0
Starting     colour-2.3.4
Building     colour-2.3.4
Completed    cabal-doctest-1.0.6
Starting     data-default-class-0.1.2.0
Building     data-default-class-0.1.2.0
Completed    data-default-class-0.1.2.0
Starting     diagrams-solve-0.1.1
Building     diagrams-solve-0.1.1
Completed    cereal-0.5.7.0
Starting     dlist-0.8.0.5
Building     dlist-0.8.0.5
Completed    diagrams-solve-0.1.1
Starting     easy-file-0.2.2
Completed    colour-2.3.4
Starting     entropy-0.4.1.4
Building     easy-file-0.2.2
Completed    dlist-0.8.0.5
Starting     erf-2.0.0.0
Building     erf-2.0.0.0
Completed    easy-file-0.2.2
Starting     file-embed-0.0.11
Building     entropy-0.4.1.4
Building     file-embed-0.0.11
Completed    erf-2.0.0.0
Starting     fingertree-0.1.4.2
Building     fingertree-0.1.4.2
Completed    entropy-0.4.1.4
Starting     groups-0.4.1.0
Completed    file-embed-0.0.11
Starting     hashable-1.2.7.0
Building     groups-0.4.1.0
Building     hashable-1.2.7.0
Completed    groups-0.4.1.0
Starting     haskell-src-exts-1.20.3
Failed to install haskell-src-exts-1.20.3
Build log ( /home/builder/.cabal/logs/ghc-8.6.3/haskell-src-exts-1.20.3-2fryh11Yuz7lCtLeeIQn8.log ):
cabal: Entering directory '/tmp/cabal-tmp-13806/haskell-src-exts-1.20.3'
Configuring haskell-src-exts-1.20.3...
cabal: The program 'happy' version >=1.19 is required but it could not be
found.

cabal: Leaving directory '/tmp/cabal-tmp-13806/haskell-src-exts-1.20.3'
Starting     integer-logarithms-1.0.2.2
Building     integer-logarithms-1.0.2.2
Completed    hashable-1.2.7.0
Completed    fingertree-0.1.4.2
Completed    integer-logarithms-1.0.2.2
Completed    basement-0.0.8
cabal: Error: some packages failed to install:
haskell-src-exts-1.20.3-2fryh11Yuz7lCtLeeIQn8 failed during the configure
step. The exception was:
ExitFailure 1
haskell-src-meta-0.8.0.3-JbAhgnac8Prmw8CgUyXzF depends on
haskell-src-meta-0.8.0.3 which failed to install.
interpolatedstring-perl6-1.0.1-CT2G0BGtILzIASunznbA2 depends on
interpolatedstring-perl6-1.0.1 which failed to install.
suavemente-0.1.0.0-IQsfQcSeCjP70POEYXa6pz depends on suavemente-0.1.0.0 which
failed to install.