Several libraries are not installed using plain name without major version.
Attempt to open those libraries dynamically will fail.
nut 2.7.3-1.6

> nut-scanner

Cannot load USB library (libusb) : file not found. USB search disabled.
Cannot load SNMP library (libnetsnmp) : file not found. SNMP search disabled.
Cannot load XML library (libneon) : file not found. XML search disabled.
Cannot load AVAHI library (libavahi-client) : file not found. AVAHI search
disabled.
Cannot load IPMI library (libfreeipmi) : file not found. IPMI search disabled.
Cannot load NUT library (libupsclient) : file not found. NUT search disabled.

> strace nut-scanner
open("/lib/libusb.la", O_RDONLY)        = -1 ENOENT (No such file or directory)
open("/usr/lib/libusb.la", O_RDONLY)    = -1 ENOENT (No such file or directory)
open("/usr/local/lib64/libusb.la", O_RDONLY) = -1 ENOENT (No such file or
directory)
open("/usr/local/lib/libusb.la", O_RDONLY) = -1 ENOENT (No such file or
directory)
access("/lib/libusb.so", R_OK)          = -1 ENOENT (No such file or directory)
access("/usr/lib/libusb.so", R_OK)      = -1 ENOENT (No such file or directory)
access("/usr/local/lib64/libusb.so", R_OK) = -1 ENOENT (No such file or
directory)
access("/usr/local/lib/libusb.so", R_OK) = -1 ENOENT (No such file or
directory)
futex(0x7ff0d014d0c8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=192663, ...}) = 0
mmap(NULL, 192663, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7ff0d0d1e000
close(3)                                = 0
open("/lib64/tls/x86_64/libusb.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such
file or directory)
stat("/lib64/tls/x86_64", 0x7ffced0882f0) = -1 ENOENT (No such file or
directory)
open("/lib64/tls/libusb.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or
directory)
stat("/lib64/tls", 0x7ffced0882f0)      = -1 ENOENT (No such file or directory)
open("/lib64/x86_64/libusb.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file
or directory)
stat("/lib64/x86_64", 0x7ffced0882f0)   = -1 ENOENT (No such file or directory)
open("/lib64/libusb.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or
directory)
stat("/lib64", {st_mode=S_IFDIR|0755, st_size=5276, ...}) = 0
open("/usr/lib64/tls/x86_64/libusb.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No
such file or directory)
stat("/usr/lib64/tls/x86_64", 0x7ffced0882f0) = -1 ENOENT (No such file or
directory)
open("/usr/lib64/tls/libusb.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file
or directory)
stat("/usr/lib64/tls", 0x7ffced0882f0)  = -1 ENOENT (No such file or directory)
open("/usr/lib64/x86_64/libusb.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such
file or directory)
stat("/usr/lib64/x86_64", 0x7ffced0882f0) = -1 ENOENT (No such file or
directory)
open("/usr/lib64/libusb.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or
directory)
stat("/usr/lib64", {st_mode=S_IFDIR|0755, st_size=136928, ...}) = 0
munmap(0x7ff0d0d1e000, 192663)          = 0
write(2, "Cannot load USB library (libusb)"..., 72Cannot load USB library
(libusb) : file not found. USB search disabled.
) = 72