diff --git a/.circleci/test/test_sort_yaml.py b/.circleci/test/test_sort_yaml.py
new file mode 100755
index 0000000000..dc6db481dd
--- /dev/null
+++ b/.circleci/test/test_sort_yaml.py
@@ -0,0 +1,14 @@
+#!/usr/bin/env python3
+
+"""
+To compare new version with previous:
+
+    ./regenerate.sh
+    meld <(git show HEAD:./config.yml | ./sort-yaml.py) <(cat config.yml | ./sort-yaml.py)
+"""
+
+
+import sys
+import yaml
+
+sys.stdout.write(yaml.dump(yaml.load(sys.stdin, Loader=yaml.FullLoader), sort_keys=True))
diff --git a/.circleci/unittest/linux/scripts/environment.yml b/.circleci/unittest/linux/scripts/environment.yml
new file mode 100644
index 0000000000..4315a2205b
--- /dev/null
+++ b/.circleci/unittest/linux/scripts/environment.yml
@@ -0,0 +1,17 @@
+# a comment for these trying times
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+  - flake8
+  - numpy >= 1.11
+  - pytest
+  - pytest-cov
+  - codecov
+  - librosa>=0.8.0
+  - llvmlite==0.31  # See https://github.com/pytorch/audio/pull/766
+  - pip
+  - pip:
+    - kaldi-io
+    - scipy
+    - parameterized