mxcl/homebrew — pull request #12011 by RuiPereira (2012-05-02 17:42:51+00:00)
Title: Properly identify POSIX uncompressed tars

The first 6 bytes are not enough to identify POSIX
uncompressed tars (257 bytes offset), so changed
the magic_bytes to read the first 262 bytes.

This is almost the same as #10226. Can be tested with a POSIX tar with this (dummy) formula:

```ruby
require 'formula'

class SrbClient < Formula
homepage 'http://www.sdsc.edu/srb/index.php'
url 'http://www.sdsc.edu/srb/tarfiles/SRB3_4_2client.tar'
md5 'cb42947abbabd7677ef4c960fc2ce2be'
version '3.4.2'

def install
system "./configure", "--disable-debug", "--disable-dependency-tracking"
end
end
```