Installing a cross-toolchain to build ARM binaries

[Tshepang Lekhonkhobe <tshepang@gmail.com>]

I tried to install a cross-toolchain so I could build Linux kernel on
amd64 (jessie) for my ARM system. I have this entry in sources.list:

    deb http://www.emdebian.org/debian sid main

When I tried to install gcc-4.7-arm-linux-gnueabi, I get an error:

    cc-4.7-arm-linux-gnueabi : Depends: libgomp1-armel-cross (>=
4.7.2-5) but it is not going to be installed

libgomp1-armel-cross in turn depends on gcc-4.8-base-armel-cross which
is not available anywhere.

I did manage to install these cross-build tools, from the same
repository, and even built a kernel that now runs on these ARM systems
some weeks ago, but not anymore. Is there something broken in that
repository? I tried a few other versions of GCC, and still get the
same issue.