>
> > Looks ok - but I do not see why use of $(shell ...) did not work out.
>
> As I understand it, the $(shell ...) construct doesn't "work" in the case
> cited above because make evaluates/expands the $(shell ...) stuff while it
> is parsing the makefile and building the command list--i.e. before it has
> issued any commands to build anything. What seems to be desired in this
> case is a file-existence test which runs "inline" with respect to the
> preceding commands. The use of $(shell ...) inside a command
> subverts/preempts that natural sequence. I think. :-)
That explains it - thanks!
Sam
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