ci/lib.sh: encapsulate Travis-specific things

diff --git a/ci/install-dependencies.sh b/ci/install-dependencies.sh
index fe6514415277c2433229a9af55a1d90c66490880..bcdcc715924c53bbcf1418b7ddeee426c94468b8 100755 (executable)
--- a/ci/install-dependencies.sh
+++ b/ci/install-dependencies.sh
@@ -37,7 +37,8 @@ osx-clang|osx-gcc)
        brew update --quiet
        # Uncomment this if you want to run perf tests:
        # brew install gnu-time
-       brew install git-lfs gettext
+       test -z "$BREW_INSTALL_PACKAGES" ||
+       brew install $BREW_INSTALL_PACKAGES
        brew link --force gettext
        brew install caskroom/cask/perforce
        ;;