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If something removes .m4 files from the aclocal directory whilst aclocal is running it gets upset. To avoid this we need to take a copy of the aclocal directory and build against this instead. [YOCTO #861] (From OE-Core rev: 6a4778e21341f031569f561e7699d2c616b60af0) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>