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     colour-2.3.5
Downloading  lz4-hs-0.1.4.0
Starting     lzlib-1.0.6.0
Starting     bz2-1.0.0.2
Downloaded   lz4-hs-0.1.4.0
Starting     lz4-hs-0.1.4.0
Building     colour-2.3.5
Building     lzlib-1.0.6.0
Building     bz2-1.0.0.2
Failed to install lz4-hs-0.1.4.0
Build log ( /home/builder/.cabal/logs/ghc-8.6.3/lz4-hs-0.1.4.0-4Bysk7K3HzIFJZvPEJAGnV.log ):
cabal: Entering directory '/tmp/cabal-tmp-815/lz4-hs-0.1.4.0'
Configuring lz4-hs-0.1.4.0...
cabal: The program 'c2hs' version >=0.28.6 is required but the version found
at /usr/bin/c2hs is version 0.28.3

cabal: Leaving directory '/tmp/cabal-tmp-815/lz4-hs-0.1.4.0'
Starting     lzma-0.0.0.3
Building     lzma-0.0.0.3
Completed    lzma-0.0.0.3
Completed    colour-2.3.5
Completed    lzlib-1.0.6.0
Completed    bz2-1.0.0.2
cabal: Error: some packages failed to install:
lz4-hs-0.1.4.0-4Bysk7K3HzIFJZvPEJAGnV failed during the configure step. The
exception was:
ExitFailure 1
sak-0.1.0.1-88cUoU3FqYPG9MkT7XxKwU depends on sak-0.1.0.1 which failed to
install.