[Buildroot] Trouble with offline build

[A]

 I'm a long-time fan, but first-time user.  I'm using buildroot-2017.11.2
for an ARM target system.

My build system doesn't have internet access, so I need the offline build
capabilities, which I am having trouble with.  The build system also is
pretty old, and tends to lack modern packages.

I do a "make source" on a cygwin system that has internet and, and copy the
whole thing over to the build system.

Then, on the build system, I do a "make", and I get undesired internet
access attempts and an ultimate failure, which I show below.

I saw an archive post from 2007 here where the OP was told there are buggy
packages that need to be patched in order for this to happen.  They are
said to be buggy because "they lack a foo-source: target.  These need to be
fixed."  (there was an attachment to the forum post, but the attachment has
since been scrubbed).

Can someone please weigh in on whether this might be what is happening with
lzip (below), and how I might go about fixing this?

I'm new enough that I'm not even sure why this package is being
downloaded.  I must have it in one of the config files, but it's not an
obvious.

A brute-force find/grep shows that there might be something about the
BR2_LZCAT variable.  I've no idea what this means.  Is there an
undocumented host dependency on lzip?  I see it's not installed on my
system.


user at host:~/src/buildroot-2017.11.2$ make source
>>> host-lzip 1.19 Downloading
--2018-02-27 22:51:58--  http://download.savannah.gnu.
org/releases/lzip/lzip-1.19.tar.gz
Resolving download.savannah.gnu.org... 208.118.235.200
Connecting to download.savannah.gnu.org|208.118.235.200|:80... connected.
HTTP request sent, awaiting response... 503 Service Unavailable
2018-02-27 22:52:03 ERROR 503: Service Unavailable.

--2018-02-27 22:52:04--  http://sources.buildroot.net/lzip-1.19.tar.gz
Resolving sources.buildroot.net... 104.27.166.48, 104.27.167.48,
2400:cb00:2048:1::681b:a730, ...
Connecting to sources.buildroot.net|104.27.166.48|:80... connected.
HTTP request sent, awaiting response... 503 Service Unavailable
2018-02-27 22:52:04 ERROR 503: Service Unavailable.

make[1]: *** [/home/user/src/buildroot-2017.11.2/output/build/host-lzip-1.19/.stamp_downloaded]
Error 1
make: *** [_all] Error 2
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