Do not use install_requires with numpy/scipy

setup.py

@@ -42,12 +42,18 @@
                                          if not r.startswith('cython')]
     SETUP_REQUIRES = []
 
+
 # list requirements for PyPI
 REQUIRES = [r.replace('>=', ' (>= ') + ')'
                       for r in INSTALL_REQUIRES + SETUP_REQUIRES]
 REQUIRES = [r.replace('==', ' (== ') for r in REQUIRES]
 
 
+# do not attempt to install numpy and scipy until they have eggs available
+INSTALL_REQUIRES = [r for r in INSTALL_REQUIRES
+                                     if not r.startswith(('numpy', 'scipy'))]
+
+
 def configuration(parent_package='', top_path=None):
     if os.path.exists('MANIFEST'): os.remove('MANIFEST')
 
@@ -67,7 +73,10 @@ def configuration(parent_package='', top_path=None):
 
 
 if __name__ == "__main__":
+    # purposely fail loudly if numpy or scipy are not available
     from numpy.distutils.core import setup
+    import scipy
+
     setup(
         name=DISTNAME,
         description=DESCRIPTION,