-# The first two arguments to that script are special: $1 is the object
-# directory. This string is prefixed to both the .o and the .d target. $2 is
-# the directory that contains the *.cmdline.h files generated by gengetopt.
+# The first three arguments to that script are special: $1 is the
+# dependency directory and $2 is the object directory. These are used
+# to prefix the .d and .o targets respectively. $3 is the directory
+# that contains the *.cmdline.h files generated by gengetopt.