N0REP0
### <pkg:a.1>
opam-version: "2.0"
depexts: "depext-1"
### OPAMNODEPEXTS=0 OPAMCONFIRMLEVEL=unsafe-yes
### opam var --global os-family=dummy-failure
Added '[os-family "dummy-failure" "Set through 'opam var'"]' to field global-variables in global configuration
### opam switch create test --empty
### : Erroneous package manager install is not blocking :
### opam install a | sed-cmd false
The following actions will be performed:
=== install 1 package
  - install a 1

The following system packages will first need to be installed:
    depext-1

<><> Handling external dependencies <><><><><><><><><><><><><><><><><><><><><><>

opam believes some required external dependencies are missing. opam can:
> 1. Run false to install them (may need root/sudo access)
  2. Display the recommended false 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

+ false 
[ERROR] System package install failed with exit code 1 at command:
            false
[ERROR] These packages are still missing: depext-1

[NOTE] You can retry with '--assume-depexts' to skip this check, or run 'opam option depext=false' to permanently disable handling of system packages.

# Return code 10 #
