title: Error in Makefile during a simple check for existing file
body: <p>within a makefile I need to check if a file exists. Regarding to this <a href="https://stackoverflow.com/questions/5553352/how-do-i-check-if-file-exists-in-makefile#20566812">answer from holms</a>, I tried it in this way:</p>
  
  <pre><code>all:
      ifeq ("","$(wildcard testFile)")
         echo "File exists"
      else
         echo "File is missing"
      endif
  </code></pre>
  
  <p>Nevertheless I get this error: </p>
  
  <pre><code>ifeq ("","")
  /bin/sh: 1: Syntax error: word unexpected (expecting ")")
  Makefile:3: recipe for target 'all' failed
  make: *** [all] Error 2
  </code></pre>
  
  <p>Where is my mistake and how to interpret this syntax error message?</p>