@@ -34,6 +34,7 @@ before_install:
34 - sudo add-apt-repository -y ppa:hvr/ghc
34 - sudo add-apt-repository -y ppa:hvr/ghc
35 - sudo apt-get update
35 - sudo apt-get update
36 - sudo apt-get install cabal-install-1.18 ghc-$GHCVER
36 - sudo apt-get install cabal-install-1.18 ghc-$GHCVER
37+ - sudo apt-get install happy-1.19.3
37 - export PATH=/opt/ghc/$GHCVER/bin:/opt/happy/1.19.3/bin:$PATH
38 - export PATH=/opt/ghc/$GHCVER/bin:/opt/happy/1.19.3/bin:$PATH