title: recipe for target 'vmlinux' failed?
body: <p>I am working on vmaware with ubuntu 16.04 
  I want to add system call to kernel like "hello world".
  So i downloaded a latest kernel, i have done some changes regarding to system call ,when i compile kernel i get this error.</p>
  
  <p>Error in terminal while compiling</p>
  
  <blockquote>
    <p>ld: cannot find opsyscall/built-in.o: No such file or directory</p>
    
    <p>Makefile:969: recipe for target 'vmlinux' failed</p>
    
    <p>make: *** [vmlinux] Error 1</p>
  </blockquote>
  
  <p>kernel's Makefile line 968 and 969 is </p>
  
  <blockquote>
    <p>vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE</p>
    
    <p>+$(call if_changed,link-vmlinux)</p>
  </blockquote>
  
  <p>In opsyscall folder i have a Makefile</p>
  
  <p>make file content :</p>
  
  <blockquote>
    <p>obj-y : syscall.o </p>
  </blockquote>
  
  <p>i have done all the changes that needed for a system call.</p>