Resolving dependencies...
Configuring clr-marshal-0.2.0.0...
Configuring file-embed-0.0.11...
Building file-embed-0.0.11...
Building clr-marshal-0.2.0.0...
Installed clr-marshal-0.2.0.0
Installed file-embed-0.0.11
Downloading clr-host-0.2.1.0...
Configuring clr-host-0.2.1.0...
Failed to install clr-host-0.2.1.0
Build log ( /home/builder/.cabal/logs/ghc-8.4.3/clr-host-0.2.1.0-CwGGea6LQQl9Zi91YD2R1r.log ):
cabal: Entering directory '/tmp/cabal-tmp-10625/clr-host-0.2.1.0'
[1 of 1] Compiling Main             ( /tmp/cabal-tmp-10625/clr-host-0.2.1.0/dist/setup/setup.hs, /tmp/cabal-tmp-10625/clr-host-0.2.1.0/dist/setup/Main.o )
Linking /tmp/cabal-tmp-10625/clr-host-0.2.1.0/dist/setup/setup ...
Configuring clr-host-0.2.1.0...
setup: The program 'csc' is required but it could not be found.

cabal: Leaving directory '/tmp/cabal-tmp-10625/clr-host-0.2.1.0'
cabal: Error: some packages failed to install:
clr-host-0.2.1.0-CwGGea6LQQl9Zi91YD2R1r failed during the configure step. The
exception was:
ExitFailure 1