Build failure: openvpn3

[Naxdy]

Steps To Reproduce

Steps to reproduce the behavior:

1. nix build github:NixOS/nixpkgs-unstable#openvpn3

Build log

...
openvpn3>   CXX      src/tests/unit/platforminfo.o
openvpn3>   CXX      src/tests/unit/sessionmgr-events.o
openvpn3>   CXX      src/tests/unit/statusevent.o
openvpn3>   CXX      src/tests/unit/syslog-facility-mapping.o
openvpn3>   CXX      src/tests/unit/dns-settings-manager-test.o
openvpn3>   CXX      src/tests/unit/dns-resolver-settings.o
openvpn3>   CXX      src/tests/unit/machine-id.o
openvpn3> src/tests/unit/machine-id.cpp: In member function 'std::string unittest::ReferenceID::hash_sha256(const std::string&)':
openvpn3> src/tests/unit/machine-id.cpp:99:28: error: 'setw' is not a member of 'std'
openvpn3>    99 |             output << std::setw(2) << std::setfill('0')
openvpn3>       |                            ^~~~
openvpn3> src/tests/unit/machine-id.cpp:41:1: note: 'std::setw' is defined in header '<iomanip>'; did you forget to '#include <iomanip>'?
openvpn3>    40 | #include <openvpn/openssl/compat.hpp>
openvpn3>   +++ |+#include <iomanip>
openvpn3>    41 |
openvpn3> src/tests/unit/machine-id.cpp:99:44: error: 'setfill' is not a member of 'std'
openvpn3>    99 |             output << std::setw(2) << std::setfill('0')
openvpn3>       |                                            ^~~~~~~
openvpn3> src/tests/unit/machine-id.cpp:99:44: note: 'std::setfill' is defined in header '<iomanip>'; did you forget to '#include <iomanip>'?
openvpn3> make[2]: *** [Makefile:4252: src/tests/unit/machine-id.o] Error 1
openvpn3> make[2]: Leaving directory '/build/source'
openvpn3> make[1]: *** [Makefile:4290: all-recursive] Error 1
openvpn3> make[1]: Leaving directory '/build/source'
openvpn3> make: *** [Makefile:2602: all] Error 2

Notify maintainers

@SCOTT-HAMILTON

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