--- setup.py.orig	2014-06-22 01:56:56.614802000 -0700
+++ setup.py	2014-06-22 01:55:54.555149273 -0700
@@ -12,10 +12,18 @@
 from distutils.errors import *
 from distutils.core import Extension, setup
 from distutils.command.build_ext import build_ext
+from distutils.spawn import find_executable
 
 # This global variable is used to hold the list of modules to be disabled.
 disabled_module_list = []
 
+def add_dir_to_list(dirlist, dir):
+    """Add the directory 'dir' to the list 'dirlist' (at the front) if
+    1) 'dir' is not already in 'dirlist'
+    2) 'dir' actually exists, and is a directory."""
+    if dir is not None and os.path.isdir(dir) and dir not in dirlist:
+        dirlist.insert(0, dir)
+
 def find_file(filename, std_dirs, paths):
     """Searches for the directory where a given file is located,
     and returns a possibly-empty list of additional directories, or None
@@ -144,12 +152,36 @@
 
         return platform
 
+    def add_multiarch_paths(self):
+        # Debian/Ubuntu multiarch support.
+        # https://wiki.ubuntu.com/MultiarchSpec
+        if not find_executable('dpkg-architecture'):
+            return
+        tmpfile = os.path.join(self.build_temp, 'multiarch')
+        if not os.path.exists(self.build_temp):
+            os.makedirs(self.build_temp)
+        ret = os.system(
+            'dpkg-architecture -qDEB_HOST_MULTIARCH > %s 2> /dev/null' %
+            tmpfile)
+        try:
+            if ret >> 8 == 0:
+                fp = open(tmpfile)
+                multiarch_path_component = fp.readline().strip()
+                fp.close()
+                add_dir_to_list(self.compiler.library_dirs,
+                                '/usr/lib/' + multiarch_path_component)
+                add_dir_to_list(self.compiler.include_dirs,
+                                '/usr/include/' + multiarch_path_component)
+        finally:
+            os.unlink(tmpfile)
+
     def detect_modules(self):
         # Ensure that /usr/local is always used
         if '/usr/local/lib' not in self.compiler.library_dirs:
             self.compiler.library_dirs.insert(0, '/usr/local/lib')
         if '/usr/local/include' not in self.compiler.include_dirs:
             self.compiler.include_dirs.insert(0, '/usr/local/include' )
+        self.add_multiarch_paths()
 
         # lib_dirs and inc_dirs are used to search for files;
         # if a file is found in one of those directories, it can
