In (info "(make) Appending")
Often it is useful to add more text to the value of a variable already
defined. You do this with a line containing '+=', like this:
objects += another.o
This takes the value of the variable 'objects', and adds the text
'another.o' to it (preceded by a single space).
Mention:
*One might think that using e.g.,
objects +=another.o
might get rid of that space, just in case it is not preferred in some
situations, but alas, there is no way to get rid of that space.
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