Maybe this will help?

Author: Patrick Thomson

.travis.yml

@@ -28,12 +28,12 @@ before_install:
 - cabal --version
 
 install:
-- cabal new-update -v hackage.haskell.org
+- cabal new-update -v
 - cabal new-configure --enable-tests --write-ghc-environment-files=always --jobs=2
-- cabal new-build --only-dependencies -j
+- cabal new-build --only-dependencies
 
 script:
-- cabal new-build -j
+- cabal new-build
 - cabal new-run semantic:test
 - cabal new-run semantic-core:spec
 # parse-examples is disabled because it slaughters our CI