On (info "(make) Automatic Variables") after
'$<'
The name of the first prerequisite. If the target got its recipe
from an implicit rule, this will be the first prerequisite added by
the implicit rule (*note Implicit Rules::).
Please add:
For instead e.g., the fourth prerequisite, use $(word 4,$^). For
e.g., the seventh through ninth, use $(wordlist 7,9,$^).
Thanks.
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