Makefile error within Dockerfile? ***No rule to make target '64'

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Since the make target exists in the Makefile, I would suggest checking whether the Makefile is in the folder which the WORKDIR instruction in your Dockerfile sets. If it’s not, you need to provide the directory, where the Makefile is located like make -C ${folder where the Makefile is} 64 (of course you need to replace ${folder where the Makefile is} with the actual path to the folder), or if applicable set WORKDIR to the folder.