make: is "v" a magic variable name?

[Edgar Fuß <ef%math.uni-bonn.de@localhost>]

Am I getting mad? Is "v" some magical variable name in (b)make?

Running this

#!/opt/pkg/bin/bmake -f

v= foo

default:
	echo ${v}

makefile with bmake (20150505) outputs -- well -- ".MAKE.LEVEL.ENV".
Using w as the variable name works as expected.

On a NetBSD-6 system (with /usr/bin/make), this simple example runs as expected,
but in a more complicated situation, v also seems to magically change it's value
and renaming it to vers cures it.