Before:

    cabal new-build               Build the package in the current
  directory or all packages in the project
    cabal new-build pkgname       Build the package named pkgname in the
  project
    cabal new-build cname       Build the component named cname in the
  project
    cabal new-build pkgname:cname       Build the component named cname
  in the package pkgname

After:

    cabal new-build               Build the package in the current
  directory or all packages in the project
    cabal new-build pkgname       Build the package named pkgname in the
  project
    cabal new-build cname         Build the component named cname in the
  project
    cabal new-build pkgname:cname Build the component named cname in the
  package pkgname