@@ -148,11 +148,15 @@ function pip_install {

     fi

     $xtrace

+    # adding SETUPTOOLS_SYS_PATH_TECHNIQUE is a workaround to keep

+    # the same behaviour of setuptools before version 25.0.0.

+    # related issue: https://github.com/pypa/pip/issues/3874

     $sudo_pip \

         http_proxy="${http_proxy:-}" \

         https_proxy="${https_proxy:-}" \

         no_proxy="${no_proxy:-}" \

         PIP_FIND_LINKS=$PIP_FIND_LINKS \

+        SETUPTOOLS_SYS_PATH_TECHNIQUE=rewrite \

         $cmd_pip $upgrade \

         $@

     result=$?