Write setup.py to compile liblex and friends.

setup.py

@@ -0,0 +1,23 @@
+from distutils.core import setup, Extension
+
+def source_paths(base_path, sources):
+    return [base_path + s for s in sources]
+
+liblex_path = 'external/liblex/'
+liblex_sources = ['eval.c', 'pairmap.c', 'pattern.c']
+liblex_source_paths = source_paths(liblex_path + 'src/', liblex_sources)
+
+liblex_libds_path = 'external/libds/'
+liblex_libds_sources = ['ht.c', 'libds.c', 'll.c', 'sprs.c', 'vec.c']
+liblex_libds_source_paths = source_paths(liblex_path + liblex_libds_path + 'src/', liblex_libds_sources)
+
+
+liblex_all_source_paths = liblex_libds_source_paths + liblex_source_paths
+
+pyliblex = Extension('pyliblex',
+        sources = ['src/pyliblexmodule.c'] + liblex_all_source_paths,
+        include_dirs = [liblex_path + 'include', liblex_path + liblex_libds_path + 'include', 'include'])
+
+setup(name='pyliblex',
+        version='0.0',
+        ext_modules = [pyliblex])