OK, on (info "(make) Automatic Variables") has
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::).
add:
To get the name of the second etc. prerequisite, use e.g., $(word 2,$+).
Thanks Sam. We would have never guessed (that is was safe to recommend.)
(Maybe elaborate if it is safe to use other than $+ too.)
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