title: Install package "locClass" in R
body: <p>I want to install a package named "locClass" in R but always failed and kept getting the following warning:</p>
  
  <blockquote>
    <p>install.packages("locClass", repos="http://download.r-forge.r-project.org/")</p>
  </blockquote>
  
  <pre><code>Package which is only available in source form, and may need compilation of C/C++/Fortran: ‘locClass’
  These will not be installed
  </code></pre>
  
  <p>The install command is referred to: <a href="https://r-forge.r-project.org/R/?group_id=1187" rel="nofollow noreferrer">https://r-forge.r-project.org/R/?group_id=1187</a></p>
  
  <p>Also, I downloaded the package source from the above website. But R returned the following:</p>
  
  <blockquote>
    <p>library(locClass)</p>
  </blockquote>
  
  <pre><code>Error in library(locClass) : ‘locClass’ is not a valid installed package
  </code></pre>
  
  <p>My R version is 3.3.3. I tried the 3.4.0 but failed the same way.</p>