Run of fresh-snapshots for alt-ergo

Try this locally (using silver-platter):

debian-svp new-upstream --snapshot alt-ergo 
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Updating certificates in /etc/ssl/certs...

0 added, 0 removed; done.

Running hooks in /etc/ca-certificates/update.d...

done.

[2021-04-24 10:17:35] Creating directory /home/janitor in schroot session.
[2021-04-24 10:17:35] Using dependency resolver: [apt, cpan, ctan, pypi, npm, go, hackage, cran, cran, octave-forge]
./configure
ERROR: Couldn't find opam in env.
To solve this, you can either install opam, provide an explicit value to the
`--prefix` argument of this script, or provide explicit values to both the
`--libdir` and `--mandir` options of this
script.
Makefile:36: Makefile.config: No such file or directory
make: *** [Makefile:306: Makefile.config] Error 1
[2021-04-24 10:17:35] Build failed with unidentified error:
[2021-04-24 10:17:35] Makefile:36: Makefile.config: No such file or directory

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