diff --git a/pipenv/core.py b/pipenv/core.py
index 2ec71775..295881cc 100644
--- a/pipenv/core.py
+++ b/pipenv/core.py
@@ -25,12 +25,11 @@ from pipenv.environments import (
 from pipenv.patched import crayons
 from pipenv.project import Project
 from pipenv.utils import (
-    convert_deps_to_pip, create_spinner, download_file,
-    escape_grouped_arguments, find_python, find_windows_executable,
-    get_canonical_names, get_source_list, is_pinned, is_python_command,
-    is_required_version, is_star, is_valid_url, parse_indexes, pep423_name,
-    prepare_pip_source_args, proper_case, python_version, run_command,
-    subprocess_run, venv_resolve_deps
+    convert_deps_to_pip, create_spinner, download_file, find_python,
+    find_windows_executable, get_canonical_names, get_source_list, is_pinned,
+    is_python_command, is_required_version, is_star, is_valid_url,
+    parse_indexes, pep423_name, prepare_pip_source_args, proper_case,
+    python_version, run_command, subprocess_run, venv_resolve_deps
 )
 
 
diff --git a/pipenv/project.py b/pipenv/project.py
index efb1885c..47f72ea0 100644
--- a/pipenv/project.py
+++ b/pipenv/project.py
@@ -350,7 +350,8 @@ class Project(object):
     def get_environment(self, allow_global=False):
         # type: (bool) -> Environment
         is_venv = is_in_virtualenv() or is_using_venv()
-        if allow_global and not is_venv:
+        use_system = os.getenv('PIPENV_USE_SYSTEM') == '1'
+        if use_system or allow_global and not is_venv:
             prefix = sys.prefix
             python = sys.executable
         else:
diff --git a/pipenv/utils.py b/pipenv/utils.py
index 25dac07f..e5d947c5 100644
--- a/pipenv/utils.py
+++ b/pipenv/utils.py
@@ -1313,8 +1313,8 @@ def venv_resolve_deps(
             results = c.stdout.strip()
             if c.returncode == 0:
                 sp.green.ok(environments.PIPENV_SPINNER_OK_TEXT.format("Success!"))
-                if not environments.is_verbose() and c.stdout.strip():
-                    click_echo(crayons.yellow(f"Warning: {c.stdout.strip()}"), err=True)
+                if not environments.is_verbose() and c.stderr.strip():
+                    click_echo(crayons.yellow(f"Warning: {c.stderr.strip()}"), err=True)
             else:
                 sp.red.fail(environments.PIPENV_SPINNER_FAIL_TEXT.format("Locking Failed!"))
                 click_echo(f"Output: {c.stdout.strip()}", err=True)