Resolving dependencies...
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Downloading  ghc-tags-core-0.2.4.1
Downloaded   ghc-tags-core-0.2.4.1
Starting     ghc-tags-core-0.2.4.1
Failed to install ghc-tags-core-0.2.4.1
Build log ( /home/builder/.cabal/logs/ghc-8.10.2/ghc-tags-core-0.2.4.1-4p4SWpIk9A9LRJTP2Y6rlc.log ):
cabal: Entering directory '/tmp/cabal-tmp-5142/ghc-tags-core-0.2.4.1'
Configuring ghc-tags-core-0.2.4.1...
cabal: The program 'cpphs' version >=1.20 is required but it could not be
found.

cabal: Leaving directory '/tmp/cabal-tmp-5142/ghc-tags-core-0.2.4.1'
cabal: Error: some packages failed to install:
ghc-tags-core-0.2.4.1-4p4SWpIk9A9LRJTP2Y6rlc failed during the configure step.
The exception was:
ExitFailure 1
ghc-tags-plugin-0.2.4.1-5OHbf5f0oJCLlh2W3T9S depends on
ghc-tags-plugin-0.2.4.1 which failed to install.