Question: I want to use ruby-2.0.0-p247 in OpenBSD-5.2 that works on QEMU.

* dmesg of my OpenBSD-box is here -> <http://pastie.org/8111667>

And, I want to use rbenv and ruby-install for installing ruby.

Okay, I installed rbenv and ruby-install into my OpenBSD-box.
But, I've seen an error when building ruby.

```
# rbenv install ruby-2.0.0-p247

```

* Response for this command is here -> <http://paste.ubuntu.com/5845506/>

Why I've seen it? Tell me please.

Best regards.

::: Postsctipt :::

* I don't want use Vagrant because some cause.

Answer: 
Do you even try out some piece of code which works or not?  

**On client side**:

```
<script type="text/javascript" language="javascript">
window.history.forward(1);
document.attachEvent("onkeydown", keydown_handler);
function keydown_handler()
{
switch (event.keyCode)
{
case 116 : // F5;
event.returnValue = false;
event.keyCode = 0;
window.status = "Disabled F5";
break;
}
}
</script>

```

**On Code Behind**:

```
protected void Page_Load(object sender, EventArgs e)
   {

     HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
     HttpContext.Current.Response.Cache.SetNoServerCaching();
     HttpContext.Current.Response.Cache.SetNoStore();   

   }

```

**Or,**

```
protected void Page_Load(object sender, EventArgs e)
{
   Response.Cache.SetCacheability(HttpCacheability.NoCache);
   Response.Cache.SetExpires(DateTime.Now.AddSeconds(-1));
   Response.Cache.SetNoStore();
}

```

**Or**,Follow it..

* [Browser-back-button-issue-after-logout](http://www.codeproject.com/Tips/135121/Browser-back-button-issue-after-logout)
Don't do it. Attempting to disable back-button or any browser functionality for that matter is not a best practice.

For avoiding access after logout, try to transfer to another specific "you are being logged out" page after clearing session. In that "you are being logged out" page do a javascript `window.location.replace` back to your login page.