It turns out that there is a bug in nut about this, in 2.8.0. I checked the pkgsrc package, and it doesn't have nut-scanner. Usually what is packaged is what upstream installs. On digging in, I found that the package did not declare a dependency on libltldl and thus it was not visibile during the build, and nut-scanner was not built.
The first bug is that this is not documented in INSTALL.nut. If it were, it would be a package bug not to provide it. It is sort of hinted at that somehwere else there is a list of prereqs, and I eventually found them, but I think "this is what you need installed to build", even if a pointer, should be front and center in a really-hard-to-miss way. And, there is a huge list of per-OS, without first things being described in terms of upstream package names in an OS/distribution-agnostic manner. The second bug is that the nut-scanner man page is installed even if nut-scanner is not built. Probably the fix is to move man pages to be with their programs so docs/code match, but that is surely a can of worms and just conditionalizing it in the Makefile.am the same way that the nut-scanner subdir is conditionalized is reasonable. I changed pkgsrc to depend on libltldl and now I get nut-scanner. I'll likely commit that change. But, the main nut package does not use usb, and I haven't figured out how that works with the usb split package. (I am not meaning to assert that nut-scanner does or does not belong as default or that users should or should not use it.) The nut-scanner I got doesn't seem that useful: OPTIONS: -C, --complete_scan: Scan all available devices except serial ports (default). * Options for USB devices scan not enabled: library not detected. * Options for SNMP devices scan not enabled: library not detected. * Options for XML/HTTP devices scan not enabled: library not detected. -O, --oldnut_scan: Scan NUT devices (old method). * Options for NUT devices (avahi method) scan not enabled: library not detected. * Options for IPMI devices scan not enabled: library not detected. -E, --eaton_serial <serial ports list>: Scan serial Eaton devices (XCP, SHUT and Q1). -T, --thread <max number of threads>: Limit the amount of scanning threads running simultaneously (not implemented in this build: no pthread support)
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