Only check for the existence of the first word of ${IMAKE} since it may

contain a command plus arguments.  We use the standard idiom to extract
the first word of a list stored in a make variable:

	VAR_CMD=	${VAR:C/^/_asdf_/1:M_asdf_*:S/^_asdf_//}

XXX This can be replaced with a more succinct use of variable modifiers
XXX when we update the bootstrap bmake to match the latest NetBSD make
XXX sources, i.e.:
XXX
XXX	VAR_CMD=	${VAR:[1]}

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