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!error
------
This is the syntax of the !error directive:

  !error message

MAKE stops processing and prints the following string when it
encounters this directive:

  Fatal makefile exit code: Error directive: message

Embed !error in conditional statements to abort processing and print
an error message, as shown in the following example:

  !if !$d(MYMACRO)
  #if MYMACRO isn't defined
  !error MYMACRO isn't defined
  !endif

If MYMACRO in the example isn't defined, MAKE prints the following
message:

  Fatal makefile 4: Error directive: MYMACRO isn't defined