diff --git a/README.md b/README.md
index 5788325..10ecda7 100644
--- a/README.md
+++ b/README.md
@@ -13,13 +13,22 @@ The following versions of Python are supported CPython 2.6+, 3.2+ and Pypy 2.1.0
 Bugs and change requests can be made
 [here](https://github.com/tonysimpson/nanomsg-python/issues).
 
-
 nanommsg library in /usr/local
 ==============================
 
 
-If you're nanomsg is in /usr/local and your machine is not configured to find it there you can rename the usr_local_setup.cfg to setup.cfg to fix the problem.
+If your nanomsg is in /usr/local and your machine is not configured to find it there you can rename the usr_local_setup.cfg to setup.cfg to fix the problem.
+
+Building and installing
+=======================
+
+**You need to build and install [nanomsg](http://nanomsg.org/) in order to use
+these bindings.**
 
+1. Linux
+    * `cd /path/to/nanomsg-python`
+    * `python setup.py build`
+    * `sudo python setup.py install`
 
 Example
 =======
diff --git a/nanomsg/__init__.py b/nanomsg/__init__.py
index ab584dc..64bf8c1 100644
--- a/nanomsg/__init__.py
+++ b/nanomsg/__init__.py
@@ -159,7 +159,7 @@ class Socket(object):
 
     """
 
-    _INT_PACKER = _Struct(str('l'))
+    _INT_PACKER = _Struct(str('i'))
 
     class _Endpoint(object):
         def __init__(self, socket, endpoint_id, address):
@@ -382,7 +382,7 @@ def get_int_option(self, level, option):
         _nn_check_positive_rtn(rtn)
         if length != size:
             raise NanoMsgError(('Returned option size (%r) should be the same'
-                                ' as size of int (%r)') % (rtn, size))
+                                ' as size of int (%r)') % (length, size))
         return Socket._INT_PACKER.unpack_from(buffer(buf))[0]
 
     def get_string_option(self, level, option, max_len=16*1024):