---
 src/tox/pytest.py       |    6 +++++-
 tests/test_provision.py |    6 +++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

--- a/src/tox/pytest.py
+++ b/src/tox/pytest.py
@@ -26,7 +26,10 @@ from _pytest.logging import LogCaptureFi
 from _pytest.monkeypatch import MonkeyPatch
 from _pytest.python import Function
 from _pytest.tmpdir import TempPathFactory
-from devpi_process import IndexServer
+try:
+    from devpi_process import IndexServer
+except ImportError:
+    IndexServer = None
 from pytest_mock import MockerFixture
 from virtualenv.info import fs_supports_symlink
 
@@ -473,6 +476,7 @@ def enable_pypi_server(monkeypatch: Monk
 
 
 @pytest.fixture(scope="session")
+@pytest.mark.skipif(IndexServer is None, reason="requires devpi_process")
 def pypi_server(tmp_path_factory: TempPathFactory) -> Iterator[IndexServer]:
     # takes around 2.5s
     path = tmp_path_factory.mktemp("pypi")
--- a/tests/test_provision.py
+++ b/tests/test_provision.py
@@ -12,7 +12,11 @@ from unittest import mock
 from zipfile import ZipFile
 
 import pytest
-from devpi_process import Index, IndexServer
+try:
+    from devpi_process import Index, IndexServer
+except ImportError:
+    Index = None
+    IndexServer = None
 from filelock import FileLock
 from packaging.requirements import Requirement