fix numpy

packages/py3_cython.rb

@@ -0,0 +1,22 @@
+require 'package'
+
+class Py3_cython < Package
+  description 'The Cython language makes writing C extensions for the Python language as easy as Python itself.'
+  homepage 'https://cython.org/'
+  @_ver = '0.29.23'
+  version @_ver
+  license 'Apache-2.0'
+  compatibility 'all'
+  source_url 'https://github.com/cython/cython.git'
+  git_hashtag @_ver
+
+  depends_on 'py3_setuptools' => :build
+
+  def self.build
+    system "python3 setup.py build #{PY3_SETUP_BUILD_OPTIONS}"
+  end
+
+  def self.install
+    system "python3 setup.py install #{PY_SETUP_INSTALL_OPTIONS}"
+  end
+end

packages/py3_numpy.rb

@@ -10,6 +10,8 @@ class Py3_numpy < Package
   source_url 'https://github.com/numpy/numpy.git'
   git_hashtag 'v' + @_ver
 
+  depends_on 'lapack'
+  depends_on 'py3_cython' => :build
   depends_on 'py3_setuptools' => :build
 
   def self.build