diff --git a/setup.py b/setup copy.py
index 4ce0007..9be4a6d 100644
--- a/setup.py
+++ b/setup
@@ -9,8 +9,7 @@ if sys.platform == "win32":
 
 sources = ['c/_cffi_backend.c']
 libraries = ['ffi']
-include_dirs = ['/usr/include/ffi',
-                '/usr/include/libffi']    # may be changed by pkg-config
+include_dirs = os.environ['FFI_INC'].split(',') if 'FFI_INC' in os.environ else []
 define_macros = [('FFI_BUILDING', '1')]   # for linking with libffi static library
 library_dirs = []
 extra_compile_args = []
@@ -105,14 +104,7 @@ def uses_msvc():
     return config.try_compile('#ifndef _MSC_VER\n#error "not MSVC"\n#endif')
 
 def use_pkg_config():
-    if sys.platform == 'darwin' and os.path.exists('/usr/local/bin/brew'):
-        use_homebrew_for_libffi()
-
-    _ask_pkg_config(include_dirs,       '--cflags-only-I', '-I', sysroot=True)
-    _ask_pkg_config(extra_compile_args, '--cflags-only-other')
-    _ask_pkg_config(library_dirs,       '--libs-only-L', '-L', sysroot=True)
-    _ask_pkg_config(extra_link_args,    '--libs-only-other')
-    _ask_pkg_config(libraries,          '--libs-only-l', '-l')
+    pass