diff --git a/Library/Homebrew/cmd/vendor-install.sh b/Library/Homebrew/cmd/vendor-install.sh
new file mode 100644
index 0000000000..7d1a79a4b1
--- /dev/null
+++ b/Library/Homebrew/cmd/vendor-install.sh
@@ -0,0 +1,196 @@
+#: @hide_from_man_page
+#:  * `vendor-install` [<target>]:
+#:     Install vendor version of Homebrew dependencies.
+
+# Hide shellcheck complaint:
+# shellcheck source=/dev/null
+source "$HOMEBREW_LIBRARY/Homebrew/utils/lock.sh"
+
+VENDOR_DIR="$HOMEBREW_LIBRARY/Homebrew/vendor"
+
+if [[ -n "$HOMEBREW_OSX" ]]
+then
+  if [[ "$HOMEBREW_PROCESSOR" = "Intel" ]]
+  then
+    ruby_URL="https://homebrew.bintray.com/bottles-portable/portable-ruby-2.0.0-p648.leopard_64.bottle.tar.gz"
+    ruby_SHA="5c1240abe4be91c9774a0089c2a38a8ccfff87c009e8e5786730c659d5e633f7"
+  else
+    ruby_URL=""
+    ruby_SHA=""
+  fi
+else
+  ruby_URL="https://homebrew.bintray.com/bottles-portable/portable-ruby-2.0.0-p648.x86_64_linux.bottle.tar.gz"
+  ruby_SHA="dbb5118a22a6a75cc77e62544a3d8786d383fab1bdaf8c154951268807357bf0"
+fi
+
+fetch() {
+  local -a curl_args
+  local sha
+  local temporary_path
+
+  curl_args=(
+    --fail \
+    --remote-time \
+    --location \
+    --user-agent "$HOMEBREW_USER_AGENT_CURL" \
+  )
+
+  if [[ -n "$HOMEBREW_QUIET" ]]
+  then
+    curl_args+=(--silent)
+  elif [[ -z "$HOMEBREW_VERBOSE" ]]
+  then
+    curl_args+=(--progress-bar)
+  fi
+
+  temporary_path="${CACHED_LOCATION}.incomplete"
+
+  mkdir -p "$HOMEBREW_CACHE"
+  [[ -n "$HOMEBREW_QUIET" ]] || echo "==> Downloading $VENDOR_URL"
+  if [[ -f "$CACHED_LOCATION" ]]
+  then
+    [[ -n "$HOMEBREW_QUIET" ]] || echo "Already downloaded: $CACHED_LOCATION"
+  else
+    if [[ -f "$temporary_path" ]]
+    then
+      "$HOMEBREW_CURL" "${curl_args[@]}" -C - "$VENDOR_URL" -o "$temporary_path"
+      if [[ $? -eq 33 ]]
+      then
+        [[ -n "$HOMEBREW_QUIET" ]] || echo "Trying a full download"
+        rm -f "$temporary_path"
+        "$HOMEBREW_CURL" "${curl_args[@]}" "$VENDOR_URL" -o "$temporary_path"
+      fi
+    else
+      "$HOMEBREW_CURL" "${curl_args[@]}" "$VENDOR_URL" -o "$temporary_path"
+    fi
+
+    if [[ ! -f "$temporary_path" ]]
+    then
+      odie "Download failed: ${VENDOR_URL}"
+    fi
+
+    trap '' SIGINT
+    mv "$temporary_path" "$CACHED_LOCATION"
+    trap - SIGINT
+  fi
+
+  if [[ -n "$(which shasum)" ]]
+  then
+    sha="$(shasum -a 256 "$CACHED_LOCATION" | cut -d' ' -f1)"
+  elif [[ -n "$(which sha256sum)" ]]
+  then
+    sha="$(sha256sum "$CACHED_LOCATION" | cut -d' ' -f1)"
+  else
+    odie "Cannot verify the checksum ('shasum' or 'sha256sum' not found)!"
+  fi
+
+  if [[ "$sha" != "$VENDOR_SHA" ]]
+  then
+    odie <<EOS
+Checksum mismatch.
+Expected: $VENDOR_SHA
+Actual: $sha
+Archive: $CACHED_LOCATION
+To retry an incomplete download, remove the file above.
+EOS
+  fi
+}
+
+install() {
+  local tar_args
+  local verb
+
+  if [[ -n "$HOMEBREW_VERBOSE" ]]
+  then
+    tar_args="xvzf"
+  else
+    tar_args="xzf"
+  fi
+
+  mkdir -p "$VENDOR_DIR/portable-$VENDOR_NAME"
+  safe_cd "$VENDOR_DIR/portable-$VENDOR_NAME"
+
+  trap '' SIGINT
+
+  if [[ -d "$VENDOR_VERSION" ]]
+  then
+    verb="reinstall"
+    mv "$VENDOR_VERSION" "$VENDOR_VERSION.reinstall"
+  elif [[ -n "$(ls -A .)" ]]
+  then
+    verb="upgrade"
+  else
+    verb="install"
+  fi
+
+  safe_cd "$VENDOR_DIR"
+  [[ -n "$HOMEBREW_QUIET" ]] || echo "==> Unpacking $(basename "$VENDOR_URL")"
+  tar "$tar_args" "$CACHED_LOCATION"
+  safe_cd "$VENDOR_DIR/portable-$VENDOR_NAME"
+
+  if "./$VENDOR_VERSION/bin/$VENDOR_NAME" --version >/dev/null 2>&1
+  then
+    ln -sfn "$VENDOR_VERSION" current
+    # remove old vendor installations by sorting files with modified time.
+    ls -t | grep -Ev "^(current|$VENDOR_VERSION)" | tail -n +4 | xargs rm -rf
+    if [[ -d "$VENDOR_VERSION.reinstall" ]]
+    then
+      rm -rf "$VENDOR_VERSION.reinstall"
+    fi
+  else
+    rm -rf "$VENDOR_VERSION"
+    if [[ -d "$VENDOR_VERSION.reinstall" ]]
+    then
+      mv "$VENDOR_VERSION.reinstall" "$VENDOR_VERSION"
+    fi
+    odie "Failed to $verb vendor $VENDOR_NAME."
+  fi
+
+  trap - SIGINT
+}
+
+homebrew-vendor-install() {
+  local option
+  local url_var
+  local sha_var
+
+  for option in "$@"
+  do
+    case "$option" in
+      -\?|-h|--help|--usage) brew help vendor-install; exit $? ;;
+      --verbose) HOMEBREW_VERBOSE=1 ;;
+      --quiet) HOMEBREW_QUIET=1 ;;
+      --debug) HOMEBREW_DEBUG=1 ;;
+      --*) ;;
+      -*)
+        [[ "$option" = *v* ]] && HOMEBREW_VERBOSE=1
+        [[ "$option" = *q* ]] && HOMEBREW_QUIET=1
+        [[ "$option" = *d* ]] && HOMEBREW_DEBUG=1
+        ;;
+      *)
+        [[ -n "$VENDOR_NAME" ]] && odie "This command does not take multiple vendor targets"
+        VENDOR_NAME="$option"
+        ;;
+    esac
+  done
+
+  [[ -z "$VENDOR_NAME" ]] && odie "This command requires one vendor target."
+  [[ -n "$HOMEBREW_DEBUG" ]] && set -x
+
+  url_var="${VENDOR_NAME}_URL"
+  sha_var="${VENDOR_NAME}_SHA"
+  VENDOR_URL="${!url_var}"
+  VENDOR_SHA="${!sha_var}"
+
+  if [[ -z "$VENDOR_URL" || -z "$VENDOR_SHA" ]]
+  then
+    odie "Cannot find a vendored version of $VENDOR_NAME."
+  fi
+
+  VENDOR_VERSION="$(<"$VENDOR_DIR/portable-${VENDOR_NAME}-version")"
+  CACHED_LOCATION="$HOMEBREW_CACHE/$(basename "$VENDOR_URL")"
+
+  lock "vendor-install-$VENDOR_NAME"
+  fetch
+  install
+}
diff --git a/Library/Homebrew/config.rb b/Library/Homebrew/config.rb
index e47b1ff951..5ba0793949 100644
--- a/Library/Homebrew/config.rb
+++ b/Library/Homebrew/config.rb
@@ -1,9 +1,3 @@
-# Where downloads (bottles, source tarballs, etc.) are cached
-HOMEBREW_CACHE = Pathname.new(ENV["HOMEBREW_CACHE"] || "~/Library/Caches/Homebrew").expand_path
-
-# Where brews installed via URL are cached
-HOMEBREW_CACHE_FORMULA = HOMEBREW_CACHE/"Formula"
-
 if ENV["HOMEBREW_BREW_FILE"]
   # Path to `bin/brew` main executable in {HOMEBREW_PREFIX}
   HOMEBREW_BREW_FILE = Pathname.new(ENV["HOMEBREW_BREW_FILE"])
@@ -29,6 +23,12 @@ HOMEBREW_LOCK_DIR = HOMEBREW_LIBRARY/"Locks"
 # Where we store built products
 HOMEBREW_CELLAR = Pathname.new(ENV["HOMEBREW_CELLAR"])
 
+# Where downloads (bottles, source tarballs, etc.) are cached
+HOMEBREW_CACHE = Pathname.new(ENV["HOMEBREW_CACHE"])
+
+# Where brews installed via URL are cached
+HOMEBREW_CACHE_FORMULA = HOMEBREW_CACHE/"Formula"
+
 # Where build, postinstall, and test logs of formulae are written to
 HOMEBREW_LOGS = Pathname.new(ENV["HOMEBREW_LOGS"] || "~/Library/Logs/Homebrew/").expand_path
 
diff --git a/Library/brew.sh b/Library/brew.sh
index 66858a7374..c1606a4ffe 100644
--- a/Library/brew.sh
+++ b/Library/brew.sh
@@ -116,6 +116,11 @@ HOMEBREW_USER_AGENT="$HOMEBREW_PRODUCT/$HOMEBREW_VERSION ($HOMEBREW_SYSTEM; $HOM
 HOMEBREW_CURL_VERSION="$("$HOMEBREW_CURL" --version 2>/dev/null | head -n1 | /usr/bin/awk '{print $1"/"$2}')"
 HOMEBREW_USER_AGENT_CURL="$HOMEBREW_USER_AGENT $HOMEBREW_CURL_VERSION"
 
+if [[ -z "$HOMEBREW_CACHE" ]]
+then
+  HOMEBREW_CACHE="$HOME/Library/Caches/Homebrew"
+fi
+
 # Declared in bin/brew
 export HOMEBREW_BREW_FILE
 export HOMEBREW_PREFIX
@@ -124,6 +129,7 @@ export HOMEBREW_LIBRARY
 
 # Declared in brew.sh
 export HOMEBREW_VERSION
+export HOMEBREW_CACHE
 export HOMEBREW_CELLAR
 export HOMEBREW_RUBY_PATH
 export HOMEBREW_SYSTEM
@@ -212,7 +218,7 @@ fi
 if [[ "$(id -u)" = "0" && "$(/usr/bin/stat -f%u "$HOMEBREW_BREW_FILE")" != "0" ]]
 then
   case "$HOMEBREW_COMMAND" in
-    analytics|install|reinstall|postinstall|link|pin|update|upgrade|create|migrate|tap|tap-pin|switch)
+    analytics|install|reinstall|postinstall|link|pin|update|upgrade|vendor-install|create|migrate|tap|tap-pin|switch)
       odie <<EOS
 Cowardly refusing to 'sudo brew $HOMEBREW_COMMAND'
 You can use brew with sudo, but only if the brew executable is owned by root.