Hello,
I'm trying to build an image for Broadcom.

Step 1-3 is fine, the problem appears when I'm using make command in usage section.
Docker version 1.12.1, build 6f9534c

Error output:

I: Extracting util-linux...
I: Extracting liblzma5...
I: Extracting zlib1g...
W: Failure trying to run: chroot /sonic-buildimage/fsroot mount -t proc proc /proc
W: See /sonic-buildimage/fsroot/debootstrap/debootstrap.log for details
Makefile:141: recipe for target 'target/sonic-generic.bin' failed
make: *** [target/sonic-generic.bin] Error 1
rm src/initramfs-tools/initramfs-tools_0.120_all.deb src/sonic-linux-kernel/linux-image-3.16.0-4->amd64_3.16.7-ckt11-2+acs8u2_amd64.deb

Thanks.