Command line variables take precedence over global variables. Make this true in the .for loops too.  The following fragment,
Command line variables take precedence over global variables.
Make this true in the .for loops too.  The following fragment,

	FOO=	foo bar

	all:
	.for f in ${FOO}
		@echo ${f}
	.endfor

when run as "make FOO=xxx" should print "xxx".  (OpenBSD had
this bug fixed for some time.)

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