(autoconf.info)Tru64 Directory Magic

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11.13.4 Tru64 `make' Creates Prerequisite Directories Magically

When a prerequisite is a subdirectory of `VPATH', Tru64 `make' creates
it in the current directory.

     $ mkdir -p foo/bar build
     $ cd build
     $ cat >Makefile <<END
     VPATH = ..
     all: foo/bar
     $ make
     mkdir foo
     mkdir foo/bar

   This can yield unexpected results if a rule uses a manual `VPATH'
search as presented before.

     VPATH = ..
     all : foo/bar
             command `test -d foo/bar || echo ../`foo/bar

   The above `command' is run on the empty `foo/bar' directory that was
created in the current directory.

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