libguestfs error

I’m trying to build the docker image from MacOS. After about half an hour, I get the following error message: ``` 428.9 libguestfs: error: /usr/bin/supermin exited with error status 1. 428.9 To see full error messages you may need to enable debugging. 428.9 Do: 428.9 export LIBGUESTFS_DEBUG=1 LIBGUESTFS_TRACE=1 428.9 and run the command again. For further information, read: 428.9 http://libguestfs.org/guestfs-faq.1.html#debugging-libguestfs 428.9 You can also run 'libguestfs-test-tool' and post the *complete* output 428.9 into a bug report or message to the libguestfs mailing list. ------ Dockerfile:9 -------------------- 8 | 9 | >>> RUN (unzip -p /tmp/Xilinx_ISE_14.7_Win10_14.7_VM_0213_1.zip ova/14.7_VM.ova | tar xv) && \ 10 | >>> rm -rf /tmp/Xilinx_ISE_14.7_Win10_14.7_VM_0213_1.zip ova/14.7_VM.ova && \ 11 | >>> (virt-copy-out -a 14.7_VM-disk001.vmdk /opt/Xilinx /opt) && \ 12 | >>> (virt-copy-out -a 14.7_VM-disk001.vmdk /home/ise/.Xilinx/Xilinx.lic /opt/Xilinx) && \ 13 | >>> rm 14.7_VM-disk001.vmdk 14 | -------------------- ``` I know next to nothing about docker, so I’m not even sure whether libguestfs should be running in my host system or in the target that is being created. Are the environment variables for debugging something I should set before calling `docker build` or are they about the environment inside the VM? I hope you can help, I’d really like to make this work.