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.

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Resolving dependencies...
Downloading  lz4-hs-0.1.1.0
Downloaded   lz4-hs-0.1.1.0
Starting     lz4-hs-0.1.1.0
Failed to install lz4-hs-0.1.1.0
Build log ( /home/builder/.cabal/logs/ghc-8.6.3/lz4-hs-0.1.1.0-KLfBUnRZuJOCMaTBKWFOR3.log ):
cabal: Entering directory '/tmp/cabal-tmp-13517/lz4-hs-0.1.1.0'
Configuring lz4-hs-0.1.1.0...
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-13517/lz4-hs-0.1.1.0'
cabal: Error: some packages failed to install:
lz4-hs-0.1.1.0-KLfBUnRZuJOCMaTBKWFOR3 failed during the configure step. The
exception was:
ExitFailure 1