diff --git a/README.rst b/README.rst
index 2f30ded7f..c69ff02ea 100644
--- a/README.rst
+++ b/README.rst
@@ -25,6 +25,11 @@ The dependencies are available via pip::
    # Add ~/.local/bin to your $PATH, e.g. by adding this to ~/.bashrc:
    PATH=$HOME/.local/bin:$PATH
 
+Or, you can use tox::
+
+   tox -e develop
+   . .tox/develop/bin/activate
+
 Build
 ~~~~~
 
diff --git a/docs/setup.py b/docs/setup.py
new file mode 100644
index 000000000..22a93a461
--- /dev/null
+++ b/docs/setup.py
@@ -0,0 +1,4 @@
+import setuptools
+
+
+setuptools.setup(setup_requires=["pbr"], pbr=True, include_package_data=True)
diff --git a/scripts/compatibility_matrix.py b/scripts/compatibility_matrix.py
index 423417ba1..df92340b2 100755
--- a/scripts/compatibility_matrix.py
+++ b/scripts/compatibility_matrix.py
@@ -95,23 +95,10 @@ def freebsd_pre_openzfs():
     #   There could be some lag between OpenZFS upstream and the FreeBSD,
     #   or even Linux implementations.
     sources = {}
-    with urlopen('https://www.freebsd.org/releases/') as web:
-        versions = findall(r'/releases/([0-9.]+?)R',
-                           web.read().decode('utf-8', 'ignore'))
-    with urlopen('https://svnweb.freebsd.org/base/release/') as web:
-        data = web.read().decode('utf-8', 'ignore')
-    actualversions = []
-    for ver in set(versions):
-        found = list(sorted(findall(
-            r'/base/release/(' + ver.replace('.', '\\.') + r'[0-9.]*)',
-            data
-            )))
-        if found:
-            actualversions.append(found[-1])
-    for ver in actualversions:
-        sources[ver] = ('https://svnweb.freebsd.org/base/release/{}/cddl/'
-                        'contrib/opensolaris/cmd/zpool/zpool-features.7'
-                        '?view=co'.format(ver))
+
+    sources['12'] = ('https://raw.githubusercontent.com/freebsd/freebsd-src/'
+                     'refs/heads/stable/12/cddl/contrib/opensolaris/'
+                     'cmd/zpool/zpool-features.7')
     return sources
 
 
@@ -182,6 +169,7 @@ def nexenta():
 
 
 openzfs_key = 'OpenZFS (Linux, FreeBSD 13+)'
+illumos_key = 'Illumos'
 sources = {
         openzfs_key: openzfs(),
         'FreeBSD pre OpenZFS': freebsd_pre_openzfs(),
@@ -190,7 +178,7 @@ def nexenta():
         'Joyent': joyent(),
         'NetBSD': netbsd(),
         'Nexenta': nexenta(),
-        'Illumos': {
+        illumos_key: {
             'master': 'https://raw.githubusercontent.com/illumos/illumos-gate/'
                       'master/usr/src/man/man7/zpool-features.7',
             },
@@ -356,11 +344,12 @@ def nexenta():
         html.write('<td class="warn">no</td>')
     for name, vers in header:
         for ver in vers:
-            # custom case for OpenZFS FreeBSD https://github.com/openzfs/zfs/pull/12735
             if (feature == 'edonr' and name == openzfs_key and '.' in ver
                     and not (int(ver.split('.')[0]) >= 2
                              and int(ver.split('.')[1]) >= 2)):
-                html.write('<td class="yes">yes<sup><a href="#note_1">1</a></sup></td>')
+                html.write('<td class="warn">yes<sup><a href="#note_1">1</a></sup></td>')
+            elif (feature == 'encryption' and name == illumos_key):
+                html.write('<td class="warn">yes<sup><a href="#note_2">2</a></sup></td>')
             elif (name, ver) in names:
                 html.write('<td class="yes">yes</td>')
             else:
@@ -371,6 +360,7 @@ def nexenta():
 html.write('<h3>Notes:</h3>\n')
 html.write('<ol>\n')
 html.write('<li id="note_1"><a href="https://github.com/openzfs/zfs/pull/12735">Edonr support was not enabled in FreeBSD with OpenZFS up to 2.1 release included</a></li>\n')
+html.write('<li id="note_2"><a href="https://illumos.topicbox.com/groups/discuss/Ta2162fbb2358fa0e">While Illumos have nearly same encryption logic, it\'s format is not 100% compatible with OpenZFS encryption format, so you may have problems with cross-platform encryption.</a></li>\n')
 html.write('</ol>\n')
 html.write('</div>\n')
 now = datetime.now().isoformat() + 'Z'
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 000000000..3f20c961b
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,29 @@
+[tox]
+envlist = py3,pep8
+skipdist = True
+skip_install = True
+
+[testenv]
+basepython = python3
+skipdist = True
+skip_install = True
+deps = pytest
+commands = pytest {posargs}
+
+[testenv:pep8]
+deps = flake8
+commands =
+  flake8
+
+[testenv:develop]
+usedevelop = true
+basepython = python3
+deps = -r{toxinidir}/docs/requirements.txt
+       esbonio>=0.12.0
+commands = {posargs}
+
+[testenv:esbonio]
+usedevelop = true
+basepython = python3
+deps = esbonio>=0.12.0
+commands = {posargs}