Remove the failsafe

setup.py

@@ -37,24 +37,7 @@ import sys
 
 from distutils.core import setup
 from distutils.extension import Extension
-
-try:
-    from Cython.Distutils import build_ext
-except ImportError:
-    sys.stderr.write("""===========================================================
-rfoo depends on Cython - http://cython.org/
-
-To install Cython follow the simple instructions at:
-http://docs.cython.org/src/quickstart/install.html
-
-Basically, you need gcc installed on your system:
-    sudo apt-get install build-essential
-
-and then setup the latest source version of Cython with:
-    sudo python setup.py install
-===========================================================\n""")
-    sys.exit(1)
-
+from distutils.command.build_ext import build_ext
 
 if 'bdist_egg' in sys.argv:
     sys.stderr.write("""===========================================================
@@ -84,6 +67,3 @@ setup(
     cmdclass = {'build_ext': build_ext},
     ext_modules = ext_modules
 )
-
-
-