Make the build script compatible with Linux and OS X as well

ffi/build.py

@@ -1,3 +1,7 @@
+#!/usr/bin/env python
+"""
+Build script for the shared library providing the C ABI bridge to LLVM.
+"""
 
 import os
 import subprocess
@@ -11,7 +15,7 @@
 
 def main_win32():
     # NOTE: the LLVM build must have the same bitness as the Python runtime.
-    # I don't know if there's an way for us to check this.
+    # I don't know if there's an easy way for us to check this.
     config = 'Release'
     if not os.path.isdir(build_dir):
         os.mkdir(build_dir)
@@ -21,6 +25,12 @@ def main_win32():
     shutil.copy(os.path.join(build_dir, config, 'llvmlite.dll'), here_dir)
 
 
+def main_posix(kind):
+    os.chdir(here_dir)
+    makefile = "Makefile.%s" % (kind,)
+    subprocess.check_call(['make', '-f', makefile])
+
+
 def main():
     if sys.platform == 'win32':
         main_win32()