diff --git a/extensions/README.rst b/extensions/README.rst
new file mode 100644
index 00000000..069dfa5b
--- /dev/null
+++ b/extensions/README.rst
@@ -0,0 +1,10 @@
+This directory contains extensions modules pre-compiled to be tested
+on Travis-CI (Ubuntu 12.04 64bit).
+
+To build the extensions modules, run::
+
+    python setup.py build_ext -i
+
+
+Then move the compiled modules to their testing package ( ./**compiledXX**, where XX is the
+python version used to run setup.py).
\ No newline at end of file
diff --git a/extensions/compiled.pyx b/extensions/compiled.pyx
new file mode 100644
index 00000000..1e7c6907
--- /dev/null
+++ b/extensions/compiled.pyx
@@ -0,0 +1,6 @@
+cdef class Foo:
+    pass
+
+
+cdef class Bar:
+    pass
diff --git a/extensions/setup.py b/extensions/setup.py
new file mode 100644
index 00000000..a13237d2
--- /dev/null
+++ b/extensions/setup.py
@@ -0,0 +1,6 @@
+from distutils.core import setup
+from Cython.Build import cythonize
+
+setup(
+    ext_modules=cythonize("compiled.pyx")
+)