NMAKE Fatal Error U1073

don't know how to make 'targetname'

The specified target does not exist, and there is no command to execute or inference rule to apply.

One of the following may be a solution:

• Check the spelling of the target name.
  
  
• If targetname is a pseudotarget, specify it as a target in another description block.
  
  
• If targetname is a macro invocation, be sure it does not expand to a null string.