2025-09-08 13:38.32: New job: Build using linux-x86_64 in
[https://github.com/mirage/mirage-skeleton.git#refs/heads/main (11d9f309072af853ae590d193fba138c45cecf71)]
OBuilder spec:
((from ocaml/opam:debian-13-ocaml-4.14)
(user (uid 1000) (gid 1000))
(workdir /home/opam)
(run (shell "sudo chown opam:opam /home/opam"))
(run (shell "sudo ln -f /usr/bin/opam-2.4 /usr/bin/opam && opam update"))
(run (network host)
(shell "opam repo add opam https://github.com/ocaml/opam-repository.git#9c3d4d2c450836918b2120fd23d975693579ae2e"))
(run (cache (download-cache (target /home/opam/.opam/download-cache)))
(network host)
(shell "sudo apt-get update && opam install -y \"mirage>=4\""))
(copy (src .) (dst /src/))
(env MODE hvt)
(workdir /src/)
(run (shell "opam exec -- make configure"))
(env MIRAGE_EXTRA_REPOS opam-overlays:https://github.com/dune-universe/opam-overlays.git#3320932b74afc1d049ceeaf60dfe501d664bb143,mirage-opam-overlays:https://github.com/dune-universe/mirage-opam-overlays.git#797cb363df3ff763c43c8fbec5cd44de2878757e)
(run (network host)
(shell "opam exec -- make lock"))
(run (cache (download-cache (target /home/opam/.opam/download-cache)))
(network host)
(shell "sudo apt-get update && opam exec -- make depends"))
(run (shell "opam monorepo list -l mirage.opam.locked"))
(run (cache (download-cache (target /home/opam/.opam/download-cache)))
(network host)
(shell "opam exec -- make pull"))
(env DUNE_CACHE enabled)
(env DUNE_CACHE_TRANSPORT direct)
(run (cache (dune-build-cache (target /home/opam/.cache/dune)))
(network host)
(shell "opam exec -- make build"))
)
2025-09-08 13:38.32: Using cache hint "mirage-ci-skeleton-debian-13-ocaml-4.14"
2025-09-08 13:38.32: Connecting to build cluster…
2025-09-08 13:38.32: Waiting for resource in pool OCluster
2025-09-08 13:38.32: Waiting for worker…
2025-09-08 13:38.32: Got resource from pool OCluster
Building on asteria.caelum.ci.dev
All commits already cached
HEAD is now at 11d9f30 Merge pull request #411 from hannesm/disable-git
(from ocaml/opam:debian-13-ocaml-4.14)
Unable to find image 'ocaml/opam:debian-13-ocaml-4.14' locally
debian-13-ocaml-4.14: Pulling from ocaml/opam
67fafc83adff: Pulling fs layer
67fafc83adff: Verifying Checksum
67fafc83adff: Download complete
67fafc83adff: Pull complete
Digest: sha256:c34460106bbe1fed142c1324203af4a93a01fd5ecdc0194bd96b3533911d2c43
Status: Downloaded newer image for ocaml/opam:debian-13-ocaml-4.14
2025-09-08 13:38.32 ---> using "2872d40d55f240e0a2da70ebf7596d35808f9b322f6ba106c5bc21f37bed29fd" from cache
/: (user (uid 1000) (gid 1000))
/: (workdir /home/opam)
/home/opam: (run (shell "sudo chown opam:opam /home/opam"))
2025-09-08 13:38.32 ---> using "5cb26c4c89f19cf8882a86430bc6e7246ec7d2b4dc9c4381e0b364e87efbcbf7" from cache
/home/opam: (run (shell "sudo ln -f /usr/bin/opam-2.4 /usr/bin/opam && opam update"))
This version of opam requires an update to the layout of /home/opam/.opam from version 2.0 to version 2.2, which can't be reverted.
You may want to back it up before going further.
Continue? [Y/n] y
[NOTE] The 'jobs' option was reset, its value was 71 and its new value will vary according to the current number of cores on your machine. You can restore the fixed value using:
opam option jobs=71 --global
Format upgrade done.
<><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><>
[default] Initialised
2025-09-08 13:38.32 ---> using "10de7b0709f46eb6ef5732e5c8e2c2938b4ac5c4831018ebe31c4c01b7a353ad" from cache
/home/opam: (run (network host)
(shell "opam repo add opam https://github.com/ocaml/opam-repository.git#9c3d4d2c450836918b2120fd23d975693579ae2e"))
[opam] Initialised
[NOTE] Repository opam has been added to the selections of switch 4.14 only.
Run `opam repository add opam --all-switches|--set-default' to use it in all existing switches, or in newly created switches, respectively.
2025-09-08 13:38.32 ---> using "5993b058706de62c826968f4373f5855d7595593ba311c46a7d94a414b210023" from cache
/home/opam: (run (cache (download-cache (target /home/opam/.opam/download-cache)))
(network host)
(shell "sudo apt-get update && opam install -y \"mirage>=4\""))
Get:1 http://deb.debian.org/debian trixie InRelease [140 kB]
Get:2 http://deb.debian.org/debian trixie-updates InRelease [47.1 kB]
Get:3 http://deb.debian.org/debian-security trixie-security InRelease [43.4 kB]
Get:4 http://deb.debian.org/debian trixie/main amd64 Packages [9669 kB]
Get:5 http://deb.debian.org/debian-security trixie-security/main amd64 Packages [33.1 kB]
Fetched 9933 kB in 1s (8991 kB/s)
Reading package lists...
The following actions will be performed:
=== install 28 packages
- install angstrom 0.16.1 [required by emile, uri]
- install astring 0.8.5 [required by mirage]
- install base64 3.5.1 [required by emile]
- install bigstringaf 0.10.0 [required by emile]
- install bos 0.2.1 [required by mirage]
- install cmdliner 1.3.0 [required by mirage]
- install conf-pkg-config 4 [required by opam-monorepo]
- install csexp 1.5.2 [required by dune-configurator]
- install domain-name 0.4.1 [required by ipaddr]
- install dune 3.20.1 [required by mirage]
- install dune-configurator 3.20.1 [required by bigstringaf]
- install emile 1.1 [required by mirage]
- install fmt 0.11.0 [required by mirage]
- install fpath 0.7.3 [required by mirage]
- install ipaddr 5.6.1 [required by mirage]
- install logs 0.9.0 [required by mirage]
- install macaddr 5.6.1 [required by ipaddr]
- install mirage 4.9.0
- install ocaml-syntax-shims 1.0.0 [required by angstrom]
- install ocamlbuild 0.16.1 [required by astring, bos]
- install ocamlfind 1.9.8 [required by astring, bos]
- install opam-monorepo 0.4.3 [required by mirage]
- install pecu 0.7 [required by emile]
- install rresult 0.7.0 [required by mirage]
- install stringext 1.6.0 [required by uri]
- install topkg 1.1.0 [required by astring, bos]
- install uri 4.4.0 [required by mirage]
- install uutf 1.0.4 [required by emile]
The following system packages will first need to be installed:
pkg-config
<><> Handling external dependencies <><><><><><><><><><><><><><><><><><><><><><>
opam believes some required external dependencies are missing. opam can:
> 1. Run apt-get to install them (may need root/sudo access)
2. Display the recommended apt-get command and wait while you run it manually (e.g. in another terminal)
3. Continue anyway, and, upon success, permanently register that this external dependency is present, but not detectable
4. Abort the installation
[1/2/3/4] 1
+ /usr/bin/sudo "apt-get" "install" "-qq" "-yy" "pkg-config"
- Selecting previously unselected package libpkgconf3:amd64.
- (Reading database ...
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 20616 files and directories currently installed.)
- Preparing to unpack .../libpkgconf3_1.8.1-4_amd64.deb ...
- Unpacking libpkgconf3:amd64 (1.8.1-4) ...
- Selecting previously unselected package pkgconf-bin.
- Preparing to unpack .../pkgconf-bin_1.8.1-4_amd64.deb ...
- Unpacking pkgconf-bin (1.8.1-4) ...
- Selecting previously unselected package pkgconf:amd64.
- Preparing to unpack .../pkgconf_1.8.1-4_amd64.deb ...
- Unpacking pkgconf:amd64 (1.8.1-4) ...
- Selecting previously unselected package pkg-config:amd64.
- Preparing to unpack .../pkg-config_1.8.1-4_amd64.deb ...
- Unpacking pkg-config:amd64 (1.8.1-4) ...
- Setting up libpkgconf3:amd64 (1.8.1-4) ...
- Setting up pkgconf-bin (1.8.1-4) ...
- Setting up pkgconf:amd64 (1.8.1-4) ...
- Setting up pkg-config:amd64 (1.8.1-4) ...
- Processing triggers for libc-bin (2.41-12) ...
<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved angstrom.0.16.1 (cached)
-> retrieved astring.0.8.5 (cached)
-> retrieved base64.3.5.1 (cached)
-> retrieved bigstringaf.0.10.0 (cached)
-> installed conf-pkg-config.4
-> retrieved bos.0.2.1 (cached)
-> retrieved cmdliner.1.3.0 (cached)
-> retrieved csexp.1.5.2 (cached)
-> retrieved domain-name.0.4.1 (cached)
-> retrieved fmt.0.11.0 (cached)
-> retrieved emile.1.1 (cached)
-> retrieved fpath.0.7.3 (cached)
-> retrieved ipaddr.5.6.1, macaddr.5.6.1 (cached)
-> retrieved logs.0.9.0 (cached)
-> retrieved ocaml-syntax-shims.1.0.0 (cached)
-> retrieved ocamlbuild.0.16.1 (cached)
-> retrieved mirage.4.9.0 (cached)
-> retrieved ocamlfind.1.9.8 (cached)
-> retrieved pecu.0.7 (cached)
-> retrieved rresult.0.7.0 (cached)
-> retrieved stringext.1.6.0 (cached)
-> retrieved topkg.1.1.0 (cached)
-> retrieved uri.4.4.0 (cached)
-> retrieved uutf.1.0.4 (cached)
-> retrieved dune.3.20.1, dune-configurator.3.20.1 (cached)
-> retrieved opam-monorepo.0.4.3 (cached)
-> installed cmdliner.1.3.0
-> installed ocamlbuild.0.16.1
-> installed ocamlfind.1.9.8
-> installed topkg.1.1.0
-> installed rresult.0.7.0
-> installed uutf.1.0.4
-> installed fmt.0.11.0
-> installed astring.0.8.5
-> installed fpath.0.7.3
-> installed logs.0.9.0
-> installed bos.0.2.1
-> installed dune.3.20.1
-> installed base64.3.5.1
-> installed csexp.1.5.2
-> installed domain-name.0.4.1
-> installed macaddr.5.6.1
-> installed ocaml-syntax-shims.1.0.0
-> installed pecu.0.7
-> installed stringext.1.6.0
-> installed ipaddr.5.6.1
-> installed dune-configurator.3.20.1
-> installed bigstringaf.0.10.0
-> installed angstrom.0.16.1
-> installed emile.1.1
-> installed uri.4.4.0
-> installed opam-monorepo.0.4.3
-> installed mirage.4.9.0
Done.
# To update the current shell environment, run: eval $(opam env)
2025-09-08 13:38.32 ---> using "b33a67e1d4de6387e30682b1f2b11611c6535123c5c53ab1a5c88edbf67fe71c" from cache
/home/opam: (copy (src .) (dst /src/))
2025-09-08 13:38.32 ---> using "3b5311ae0aec0534db801d82e7bcb29d751716f3fb49a5eddc30eda8a1ed64a4" from cache
/home/opam: (env MODE hvt)
/home/opam: (workdir /src/)
/src/: (run (shell "opam exec -- make configure"))
mirage configure -f tutorial/noop/config.ml -t hvt
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f tutorial/hello/config.ml -t hvt
adding unit argument to 'start ()' (to delay execution)
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f tutorial/hello-key/config.ml -t hvt
adding unit argument to 'start ()' (to delay execution)
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f tutorial/lwt/echo_server/config.ml -t hvt
adding unit argument to 'start ()' (to delay execution)
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f tutorial/lwt/heads1/config.ml -t hvt
adding unit argument to 'start ()' (to delay execution)
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f tutorial/lwt/heads2/config.ml -t hvt
adding unit argument to 'start ()' (to delay execution)
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f tutorial/lwt/timeout1/config.ml -t hvt
adding unit argument to 'start ()' (to delay execution)
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f tutorial/lwt/timeout2/config.ml -t hvt
adding unit argument to 'start ()' (to delay execution)
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f tutorial/app_info/config.ml -t hvt
adding unit argument to 'start ()' (to delay execution)
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f device-usage/clock/config.ml -t hvt
adding unit argument to 'start ()' (to delay execution)
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f device-usage/conduit_server/config.ml -t hvt
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f device-usage/http-fetch/config.ml -t hvt
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f device-usage/kv_ro/config.ml -t hvt
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f device-usage/network/config.ml -t hvt
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f device-usage/ping6/config.ml -t hvt
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f device-usage/disk-lottery/config.ml -t hvt
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f applications/dhcp/config.ml -t hvt
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f applications/http/config.ml -t hvt
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f applications/dns/config.ml -t hvt
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f applications/crypto/config.ml -t hvt
adding unit argument to 'start ()' (to delay execution)
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
mirage configure -f applications/static_website_tls/config.ml -t hvt
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
dd if=/dev/zero of=disk.img count=100000
100000+0 records in
100000+0 records out
51200000 bytes (51 MB, 49 MiB) copied, 0.239132 s, 214 MB/s
mirage configure -f device-usage/block/config.ml -t hvt
Successfully configured the unikernel. Now run 'make' (or more fine-grained steps: 'make all', 'make depends', or 'make lock').
2025-09-08 13:38.44 ---> saved as "e97e86df1504098285a844f90784e8ddcb5fdb2ce56c292f09d42db34336a465"
/src/: (env MIRAGE_EXTRA_REPOS opam-overlays:https://github.com/dune-universe/opam-overlays.git#3320932b74afc1d049ceeaf60dfe501d664bb143,mirage-opam-overlays:https://github.com/dune-universe/mirage-opam-overlays.git#797cb363df3ff763c43c8fbec5cd44de2878757e)
/src/: (run (network host)
(shell "opam exec -- make lock"))
[opam-overlays] Initialised
[NOTE] Repository opam-overlays has been added to the selections of switch 4.14 only.
Run `opam repository add opam-overlays --all-switches|--set-default' to use it in all existing switches, or in newly created switches, respectively.
[mirage-opam-overlays] Initialised
[NOTE] Repository mirage-opam-overlays has been added to the selections of switch 4.14 only.
Run `opam repository add mirage-opam-overlays --all-switches|--set-default' to use it in all existing switches, or in newly created switches, respectively.
env OPAMVAR_monorepo="opam-monorepo" opam monorepo lock --recurse-opam noop-hvt hello-hvt hello-key-hvt echo_server-hvt heads1-hvt heads2-hvt timeout1-hvt timeout2-hvt echo_server-hvt app-info-hvt speaking_clock-hvt conduit_server-hvt http-fetch-hvt kv_ro-hvt network-hvt ping-hvt lottery-hvt dhcp-hvt minipaf-hvt resolve-hvt crypto-test-hvt https-hvt block_test-hvt --build-only --ocaml-version 4.14.2 -l ./mirage.opam.locked
==> Using 22 locally scanned packages as the targets.
==> Found 150 opam dependencies for the target packages.
==> Querying opam database for their metadata and Dune compatibility.
==> Calculating exact pins for each of them.
==> Wrote lockfile with 97 entries to mirage.opam.locked. You can now run opam monorepo pull to fetch their sources.
Repositories removed from the selections of switch 4.14. Use '--all' to forget about them altogether.
Repositories removed from the selections of switch 4.14. Use '--all' to forget about them altogether.
2025-09-08 13:39.00 ---> saved as "e58cba0da0a756efcdf77356fd7cf964e05855b416a55ecba9799ceaa9239973"
/src/: (run (cache (download-cache (target /home/opam/.opam/download-cache)))
(network host)
(shell "sudo apt-get update && opam exec -- make depends"))
Hit:1 http://deb.debian.org/debian trixie InRelease
Get:2 http://deb.debian.org/debian trixie-updates InRelease [47.1 kB]
Get:3 http://deb.debian.org/debian-security trixie-security InRelease [43.4 kB]
Get:4 http://deb.debian.org/debian-security trixie-security/main amd64 Packages [34.0 kB]
Fetched 125 kB in 0s (1403 kB/s)
Reading package lists...
opam install tutorial/noop/mirage/*.opam tutorial/hello/mirage/*.opam tutorial/hello-key/mirage/*.opam tutorial/lwt/echo_server/mirage/*.opam tutorial/lwt/heads1/mirage/*.opam tutorial/lwt/heads2/mirage/*.opam tutorial/lwt/timeout1/mirage/*.opam tutorial/lwt/timeout2/mirage/*.opam tutorial/lwt/echo_server/mirage/*.opam tutorial/app_info/mirage/*.opam device-usage/clock/mirage/*.opam device-usage/conduit_server/mirage/*.opam device-usage/http-fetch/mirage/*.opam device-usage/kv_ro/mirage/*.opam device-usage/network/mirage/*.opam device-usage/ping6/mirage/*.opam device-usage/disk-lottery/mirage/*.opam applications/dhcp/mirage/*.opam applications/http/mirage/*.opam applications/dns/mirage/*.opam applications/crypto/mirage/*.opam applications/static_website_tls/mirage/*.opam device-usage/block/mirage/*.opam --deps-only --yes
[WARNING] Failed checks on noop-hvt package definition from source at file:///src/tutorial/noop/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on hello-hvt package definition from source at file:///src/tutorial/hello/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on hello-key-hvt package definition from source at file:///src/tutorial/hello-key/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on echo_server-hvt package definition from source at file:///src/tutorial/lwt/echo_server/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on heads1-hvt package definition from source at file:///src/tutorial/lwt/heads1/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on heads2-hvt package definition from source at file:///src/tutorial/lwt/heads2/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on timeout1-hvt package definition from source at file:///src/tutorial/lwt/timeout1/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on timeout2-hvt package definition from source at file:///src/tutorial/lwt/timeout2/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on echo_server-hvt package definition from source at file:///src/tutorial/lwt/echo_server/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on app-info-hvt package definition from source at file:///src/tutorial/app_info/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on speaking_clock-hvt package definition from source at file:///src/device-usage/clock/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on conduit_server-hvt package definition from source at file:///src/device-usage/conduit_server/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on http-fetch-hvt package definition from source at file:///src/device-usage/http-fetch/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on kv_ro-hvt package definition from source at file:///src/device-usage/kv_ro/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on network-hvt package definition from source at file:///src/device-usage/network/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on ping-hvt package definition from source at file:///src/device-usage/ping6/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on lottery-hvt package definition from source at file:///src/device-usage/disk-lottery/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on dhcp-hvt package definition from source at file:///src/applications/dhcp/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on minipaf-hvt package definition from source at file:///src/applications/http/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on resolve-hvt package definition from source at file:///src/applications/dns/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on crypto-test-hvt package definition from source at file:///src/applications/crypto/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on https-hvt package definition from source at file:///src/applications/static_website_tls/mirage:
warning 68: Missing field 'license'
[WARNING] Failed checks on block_test-hvt package definition from source at file:///src/device-usage/block/mirage:
warning 68: Missing field 'license'
The following actions will be performed:
=== install 5 packages
- install conf-libseccomp 1 [required by solo5]
- install conf-which 1 [required by ocaml-solo5]
- install ocaml-solo5 0.8.5 [required by timeout1-hvt, resolve-hvt, noop-hvt, etc.]
- install ocaml-src 4.14.2 [required by ocaml-solo5]
- install solo5 0.9.2 [required by timeout1-hvt, resolve-hvt, noop-hvt, etc.]
The following system packages will first need to be installed:
libseccomp-dev
<><> Handling external dependencies <><><><><><><><><><><><><><><><><><><><><><>
opam believes some required external dependencies are missing. opam can:
> 1. Run apt-get to install them (may need root/sudo access)
2. Display the recommended apt-get command and wait while you run it manually (e.g. in another terminal)
3. Continue anyway, and, upon success, permanently register that this external dependency is present, but not detectable
4. Abort the installation
[1/2/3/4] 1
+ /usr/bin/sudo "apt-get" "install" "-qq" "-yy" "libseccomp-dev"
- Selecting previously unselected package libseccomp-dev:amd64.
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(Reading database ... 20653 files and directories currently installed.)
- Preparing to unpack .../libseccomp-dev_2.6.0-2_amd64.deb ...
- Unpacking libseccomp-dev:amd64 (2.6.0-2) ...
- Setting up libseccomp-dev:amd64 (2.6.0-2) ...
<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved ocaml-solo5.0.8.5 (cached)
-> retrieved ocaml-src.4.14.2 (cached)
-> retrieved solo5.0.9.2 (cached)
-> installed conf-libseccomp.1
-> installed conf-which.1
-> installed ocaml-src.4.14.2