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     base-prelude-1.3
Starting     StateVar-1.1.1.1
Starting     base-compat-0.10.5
Building     base-orphans-0.8
Building     base-prelude-1.3
Building     StateVar-1.1.1.1
Building     base-compat-0.10.5
Completed    base-orphans-0.8
Starting     basement-0.0.8
Completed    StateVar-1.1.1.1
Starting     blaze-builder-0.4.1.0
Building     basement-0.0.8
Building     blaze-builder-0.4.1.0
Completed    blaze-builder-0.4.1.0
Starting     byteable-0.1.1
Completed    base-compat-0.10.5
Starting     cabal-doctest-1.0.6
Building     byteable-0.1.1
Completed    base-prelude-1.3
Starting     cereal-0.5.7.0
Building     cabal-doctest-1.0.6
Building     cereal-0.5.7.0
Completed    byteable-0.1.1
Starting     clock-0.7.2
Building     clock-0.7.2
Completed    cabal-doctest-1.0.6
Starting     colour-2.3.4
Completed    clock-0.7.2
Starting     data-binary-ieee754-0.4.4
Building     colour-2.3.4
Building     data-binary-ieee754-0.4.4
Completed    data-binary-ieee754-0.4.4
Starting     data-default-class-0.1.2.0
Building     data-default-class-0.1.2.0
Completed    cereal-0.5.7.0
Starting     digest-0.0.1.2
Completed    data-default-class-0.1.2.0
Starting     directory-tree-0.12.1
Building     digest-0.0.1.2
Building     directory-tree-0.12.1
Completed    digest-0.0.1.2
Starting     dlist-0.8.0.5
Building     dlist-0.8.0.5
Completed    colour-2.3.4
Starting     file-embed-0.0.11
Completed    directory-tree-0.12.1
Starting     fmlist-0.9.2
Building     file-embed-0.0.11
Building     fmlist-0.9.2
Completed    dlist-0.8.0.5
Starting     hashable-1.2.7.0
Completed    fmlist-0.9.2
Building     hashable-1.2.7.0
Starting     haskell-src-exts-1.20.3
Completed    file-embed-0.0.11
Starting     hourglass-0.2.12
Building     hourglass-0.2.12
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-6633/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-6633/haskell-src-exts-1.20.3'
Starting     integer-logarithms-1.0.2.2
Building     integer-logarithms-1.0.2.2
Completed    integer-logarithms-1.0.2.2
Completed    hashable-1.2.7.0
Completed    hourglass-0.2.12
Completed    basement-0.0.8
cabal: Error: some packages failed to install:
futhark-0.8.1-7T5cQRiYfMG4gygHCmUGAz depends on futhark-0.8.1 which 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.
language-c-quote-0.12.2-Jeg5vkYYeDA5j7AfPZR1j2 depends on
language-c-quote-0.12.2 which failed to install.