dmake 4.12 on the below makefile.mk fails with "`b:' not found, and can't be
made" as it apparently mis-parses the "{$X}:" part ("{$X} :" would work, but
dmake/man/dmake.nc states that "[the] rule operator [...] does not require white
space to precede or follow it").
X = a b
Y .PHONY : $X
a b :
touch $@
{$X}: makefile.mk
dmake 4.12 on the below makefile.mk fails with "`b:' not found, and can't be made" as it apparently mis-parses the "{$X}:" part ("{$X} :" would work, but dmake/man/dmake.nc states that "[the] rule operator [...] does not require white space to precede or follow it").