Resolving dependencies...
Starting     ghc-parser-0.2.3.0
Failed to install ghc-parser-0.2.3.0
Build log ( /home/builder/.cabal/logs/ghc-8.10.2/ghc-parser-0.2.3.0-DuayyapWIV03QiuN2cb8uw.log ):
cabal: Entering directory '/tmp/cabal-tmp-20145/ghc-parser-0.2.3.0'
Configuring ghc-parser-0.2.3.0...
cabal: The program 'cpphs' is required but it could not be found.

cabal: Leaving directory '/tmp/cabal-tmp-20145/ghc-parser-0.2.3.0'
cabal: Error: some packages failed to install:
ghc-parser-0.2.3.0-DuayyapWIV03QiuN2cb8uw failed during the configure step.
The exception was:
ExitFailure 1