diff --git a/buildout.cfg b/buildout.cfg
index 6737ab6bd9..e2bb8e7bc5 100644
--- a/buildout.cfg
+++ b/buildout.cfg
@@ -58,7 +58,7 @@ eggs = ZServer
 
 [zopepy]
 recipe = zc.recipe.egg
-interpreter = ${tox:env}
+interpreter = zopepy
 eggs = Zope2
 
 
@@ -131,7 +131,7 @@ eggs =
 [allpy]
 recipe = zc.recipe.egg
 eggs = ${alltests:eggs}
-interpreter = all${tox:env}
+interpreter = allpy
 
 
 [sphinx]
diff --git a/src/Zope2/utilities/copyzopeskel.py b/src/Zope2/utilities/copyzopeskel.py
index 3f1f346fcd..15f9954f65 100755
--- a/src/Zope2/utilities/copyzopeskel.py
+++ b/src/Zope2/utilities/copyzopeskel.py
@@ -65,8 +65,6 @@
 import sys
 import getopt
 
-CVS_DIRS = [os.path.normcase("CVS"), os.path.normcase(".svn")]
-
 
 def main():
     try:
@@ -180,8 +178,8 @@ def copyskel(sourcedir, targetdir, uid, gid, **replacements):
     os.chdir(sourcedir)
     try:
         try:
-            os.path.walk(os.curdir, copydir,
-                         (targetdir, replacements, uid, gid))
+            for root, dirs, files in os.walk(os.curdir):
+                copydir(root, dirs, files, targetdir, replacements, uid, gid)
         finally:
             os.chdir(pwd)
     except (IOError, OSError) as msg:
@@ -189,40 +187,34 @@ def copyskel(sourcedir, targetdir, uid, gid, **replacements):
         sys.exit(1)
 
 
-def copydir(args, sourcedir, names):
-    targetdir, replacements, uid, gid = args
-    # Don't recurse into CVS directories:
-    for name in names[:]:
-        if os.path.normcase(name) in CVS_DIRS:
-            names.remove(name)
-        elif os.path.isfile(os.path.join(sourcedir, name)):
-            # Copy the file:
-            sn, ext = os.path.splitext(name)
-            if os.path.normcase(ext) == ".in":
-                dst = os.path.join(targetdir, sourcedir, sn)
-                if os.path.exists(dst):
-                    continue
-                copyin(os.path.join(sourcedir, name), dst, replacements, uid,
-                       gid)
-                if uid is not None:
-                    os.chown(dst, uid, gid)
-            else:
-                src = os.path.join(sourcedir, name)
-                dst = os.path.join(targetdir, src)
-                if os.path.exists(dst):
-                    continue
-                shutil.copyfile(src, dst)
-                shutil.copymode(src, dst)
-                if uid is not None:
-                    os.chown(dst, uid, gid)
+def copydir(sourcedir, dirs, files, targetdir, replacements, uid, gid):
+    for name in dirs:
+        dn = os.path.abspath(os.path.join(targetdir, sourcedir, name))
+        if not os.path.exists(dn):
+            os.mkdir(dn)
+            shutil.copymode(os.path.join(sourcedir, name), dn)
+            if uid is not None:
+                os.chown(dn, uid, gid)
+
+    for name in files:
+        sn, ext = os.path.splitext(name)
+        if os.path.normcase(ext) == ".in":
+            dst = os.path.join(targetdir, sourcedir, sn)
+            if os.path.exists(dst):
+                continue
+            copyin(os.path.join(sourcedir, name), dst, replacements, uid,
+                   gid)
+            if uid is not None:
+                os.chown(dst, uid, gid)
         else:
-            # Directory:
-            dn = os.path.join(targetdir, sourcedir, name)
-            if not os.path.exists(dn):
-                os.mkdir(dn)
-                shutil.copymode(os.path.join(sourcedir, name), dn)
-                if uid is not None:
-                    os.chown(dn, uid, gid)
+            src = os.path.join(sourcedir, name)
+            dst = os.path.abspath(os.path.join(targetdir, src))
+            if os.path.exists(dst):
+                continue
+            shutil.copyfile(src, dst)
+            shutil.copymode(src, dst)
+            if uid is not None:
+                os.chown(dst, uid, gid)
 
 
 def copyin(src, dst, replacements, uid, gid):
@@ -246,5 +238,6 @@ def usage(stream, msg=None):
     program = os.path.basename(sys.argv[0])
     stream.write(__doc__ % {"program": program})
 
+
 if __name__ == '__main__':
     main()
diff --git a/src/Zope2/utilities/mkwsgiinstance.py b/src/Zope2/utilities/mkwsgiinstance.py
index 3389755efb..ecc79a614a 100644
--- a/src/Zope2/utilities/mkwsgiinstance.py
+++ b/src/Zope2/utilities/mkwsgiinstance.py
@@ -189,7 +189,7 @@ def write_inituser(fn, user, password):
     import binascii
     from hashlib import sha1 as sha
     fp = open(fn, "w")
-    pw = binascii.b2a_base64(sha(password).digest())[:-1]
+    pw = binascii.b2a_base64(sha(password.encode('utf-8')).digest())[:-1]
     fp.write('%s:{SHA}%s\n' % (user, pw))
     fp.close()
     os.chmod(fn, 0o644)
@@ -209,7 +209,7 @@ def get_zope2path(python):
     """ Get Zope2 path from selected Python interpreter.
     """
     zope2file = ''
-    p = os.popen('"%s" -c"import Zope2; print Zope2.__file__"' % python)
+    p = os.popen('"%s" -c"import Zope2; print(Zope2.__file__)"' % python)
     try:
         zope2file = p.readline()[:-1]
     finally:
@@ -220,5 +220,6 @@ def get_zope2path(python):
         zope2file = Zope2.__file__
     return os.path.abspath(os.path.dirname(os.path.dirname(zope2file)))
 
+
 if __name__ == "__main__":
     main()
diff --git a/util.py b/util.py
index a97b26adb9..71a5673ca2 100644
--- a/util.py
+++ b/util.py
@@ -1,6 +1,10 @@
-from ConfigParser import RawConfigParser
 import os
 
+try:
+    from configparser import RawConfigParser
+except ImportError:
+    from ConfigParser import RawConfigParser
+
 HERE = os.path.abspath(os.path.dirname(__file__))
 
 
@@ -31,7 +35,7 @@ def generate(in_, out):
             continue
         requirements.append('%s==%s\n' % (name, pin))
 
-    with open(out_file, 'wb') as fd:
+    with open(out_file, 'w') as fd:
         fd.write(zope_requirement)
         for req in sorted(requirements):
             fd.write(req)