One way to resolve this error is to make the following change in src/segment.c:

~~~~
--- nlmake-1.13.1.2+030617.orig/src/segment.c
+++ nlmake-1.13.1.2+030617/src/segment.c
@@ -244,7 +244,7 @@ process_segment (void)

headeroffset = strlen (str) - 1;

  • fprintf (outfilep, str);
  • fprintf (outfilep, "%s", str);

~~~