title: Unable to install Git-core+svn by MacPorts
body: <p>I am trying to install Git-core with svn to my Mac unsuccessfully by</p>
  
  <pre><code>$ sudo port install git-core +svn
  ---&gt;  Verifying checksum(s) for db46
  Error: Checksum (md5) mismatch for patch.4.6.21.3
  Error: Target org.macports.checksum returned: Unable to verify file checksums
  Error: The following dependencies failed to build: p5-svn-simple subversion-perlbindings apr-util db46 sqlite3 cyrus-sasl2 neon serf subversion p5-term-readkey
  Error: Status 1 encountered during processing.
  </code></pre>
  
  <p>I have tried to solve the problem unsuccessfully by</p>
  
  <pre><code>sudo port -f clean --all {neon, subversion,...}
  </code></pre>
  
  <p>How can you solve the problem?</p>
  
  <p><strong>Solved:</strong></p>
  
  <p>A program called Peerguardian blocked the installation. When I removed it, everything works now. Great thanks to all repliers!</p>