feb75d
diff --git a/tests/test_virtualenv.py b/tests/test_virtualenv.py
feb75d
index ce45ede..7946a16 100644
feb75d
--- a/tests/test_virtualenv.py
feb75d
+++ b/tests/test_virtualenv.py
feb75d
@@ -4,11 +4,16 @@ import os
feb75d
 import shutil
feb75d
 import sys
feb75d
 import tempfile
feb75d
+import zipfile
feb75d
 import pytest
feb75d
 import platform  # noqa
feb75d
 
feb75d
 from mock import patch, Mock
feb75d
 
feb75d
+try:
feb75d
+    from pathlib import Path
feb75d
+except ImportError:
feb75d
+    from pathlib2 import Path
feb75d
 
feb75d
 def test_version():
feb75d
     """Should have a version string"""
feb75d
@@ -139,3 +144,44 @@ def test_always_copy_option():
feb75d
                     " symlink (to %s)" % (full_name, os.readlink(full_name))
feb75d
     finally:
feb75d
         shutil.rmtree(tmp_virtualenv)
feb75d
+
feb75d
+
feb75d
+def test_missing_certifi_pem(tmp_path):
feb75d
+    """Make sure that we can still create virtual environment if pip is
feb75d
+    patched to not use certifi's cacert.pem and the file is removed.
feb75d
+    This can happen if pip is packaged by Linux distributions."""
feb75d
+    proj_dir = Path(__file__).parent.parent
feb75d
+    support_original = proj_dir / "virtualenv_support"
feb75d
+    pip_wheel = sorted(support_original.glob("pip*whl"))[0]
feb75d
+    whl_name = pip_wheel.name
feb75d
+
feb75d
+    wheeldir = tmp_path / "wheels"
feb75d
+    wheeldir.mkdir()
feb75d
+    tmpcert = tmp_path / "tmpcert.pem"
feb75d
+    cacert = "pip/_vendor/requests/cacert.pem"
feb75d
+    certifi = "pip/_vendor/requests/certs.py"
feb75d
+    oldpath = b"os.path.join(os.path.dirname(__file__), 'cacert.pem')"
feb75d
+    newpath = "r'{}'".format(tmpcert).encode()
feb75d
+    removed = False
feb75d
+    replaced = False
feb75d
+
feb75d
+    with zipfile.ZipFile(str(pip_wheel), "r") as whlin:
feb75d
+        with zipfile.ZipFile(str(wheeldir / whl_name), "w") as whlout:
feb75d
+            for item in whlin.infolist():
feb75d
+                buff = whlin.read(item.filename)
feb75d
+                if item.filename == cacert:
feb75d
+                    tmpcert.write_bytes(buff)
feb75d
+                    removed = True
feb75d
+                    continue
feb75d
+                if item.filename == certifi:
feb75d
+                    nbuff = buff.replace(oldpath, newpath)
feb75d
+                    assert nbuff != buff
feb75d
+                    buff = nbuff
feb75d
+                    replaced = True
feb75d
+                whlout.writestr(item, buff)
feb75d
+
feb75d
+    assert removed and replaced
feb75d
+
feb75d
+    venvdir = tmp_path / "venv"
feb75d
+    search_dirs = [str(wheeldir), str(support_original)]
feb75d
+    virtualenv.create_environment(str(venvdir), search_dirs=search_dirs)
feb75d
diff --git a/virtualenv.egg-info/PKG-INFO b/virtualenv.egg-info/PKG-INFO
feb75d
index 11f5c75..501e81a 100644
feb75d
--- a/virtualenv.egg-info/PKG-INFO
feb75d
+++ b/virtualenv.egg-info/PKG-INFO
feb75d
@@ -1,10 +1,12 @@
feb75d
-Metadata-Version: 1.1
feb75d
+Metadata-Version: 1.2
feb75d
 Name: virtualenv
feb75d
 Version: 15.1.0
feb75d
 Summary: Virtual Python Environment builder
feb75d
 Home-page: https://virtualenv.pypa.io/
feb75d
-Author: Jannis Leidel, Carl Meyer and Brian Rosner
feb75d
-Author-email: python-virtualenv@groups.google.com
feb75d
+Author: Ian Bicking
feb75d
+Author-email: ianb@colorstudy.com
feb75d
+Maintainer: Jannis Leidel, Carl Meyer and Brian Rosner
feb75d
+Maintainer-email: python-virtualenv@groups.google.com
feb75d
 License: MIT
feb75d
 Description: Virtualenv
feb75d
         ==========
feb75d
diff --git a/virtualenv.py b/virtualenv.py
feb75d
index a174b8a..5699998 100755
feb75d
--- a/virtualenv.py
feb75d
+++ b/virtualenv.py
feb75d
@@ -861,7 +861,10 @@ def install_wheel(project_names, py_executable, search_dirs=None,
feb75d
 
feb75d
         import pip
feb75d
 
feb75d
-        cert_data = pkgutil.get_data("pip._vendor.requests", "cacert.pem")
feb75d
+        try:
feb75d
+            cert_data = pkgutil.get_data("pip._vendor.requests", "cacert.pem")
feb75d
+        except IOError:
feb75d
+            cert_data = None
feb75d
         if cert_data is not None:
feb75d
             cert_file = tempfile.NamedTemporaryFile(delete=False)
feb75d
             cert_file.write(cert_data)