fix host_setuptools recipe

recipes/cryptography/__init__.py

@@ -1,3 +1,4 @@
+from os.path import join
 from toolchain import CythonRecipe
 
 
@@ -12,5 +13,10 @@ class CryptographyRecipe(CythonRecipe):
     depends = ["host_setuptools", "six", "idna", "pyasn1"]
     cythonize = False
 
+    def get_recipe_env(self, arch):
+        env = super(CryptographyRecipe, self).get_recipe_env(arch)
+        env["CC"] += " -I{}".format(
+            join(self.ctx.dist_dir, "include", arch.arch, "libffi"))
+        return env
 
 recipe = CryptographyRecipe()

recipes/host_setuptools/__init__.py

@@ -14,8 +14,21 @@ class HostSetuptools(Recipe):
     def prebuild_arch(self, arch):
         hostpython = sh.Command(self.ctx.hostpython)
         sh.curl("-O",  "https://bootstrap.pypa.io/ez_setup.py")
-        # Installed setuptools egg should be extracted in hostpython
-        # site-packages(v28.3.0)
         shprint(hostpython, "./ez_setup.py")
+        # Extract setuptools egg and remove .pth files. Otherwise subsequent
+        # python package installations using setuptools will raise exceptions.
+        # Setuptools version 28.3.0
+        site_packages_path = join(
+            self.ctx.dist_dir, 'hostpython',
+            'lib', 'python2.7', 'site-packages')
+        os.chdir(site_packages_path)
+        with open('setuptools.pth', 'r') as f:
+            setuptools_egg_path = f.read().strip('./').strip('\n')
+            unzip = sh.Command('unzip')
+            shprint(unzip, setuptools_egg_path)
+        os.remove(setuptools_egg_path)
+        os.remove('setuptools.pth')
+        os.remove('easy-install.pth')
+        shutil.rmtree('EGG-INFO')
 
 recipe = HostSetuptools()