[Nut-upsdev] ./configure excludes USB drivers and documentation

[Roger Price]

Sorry for such a noob question, but I'm having a problem with 2.7.4 
./configure .

I down loaded the 2.7.4 tarball, unzipped. read the INSTALL and typed 
./configure . The output of ./configure shows "build serial drivers: yes" 
and build everything else is "no".

Looking at config.log, I see

configure:8104: checking for libusb version via pkg-config
configure:8111: checking via libusb-config
configure:8123: result: none found
configure:8126: checking for libusb cflags
configure:8143: result:
configure:8146: checking for libusb ldflags
configure:8163: result: -lusb
configure:8168: checking for usb.h
configure:8168: gcc -c   conftest.c >&5
conftest.c:92:17: fatal error: usb.h: No such file or directory
  #include <usb.h>

config.log also reports

Configured with: ../configure --prefix=/usr --infodir=/usr/share/info 
--mandir=/usr/share/man --libdir=/usr/lib64 --libexecdir=/usr/lib64 ...

The 2.7.4 tarball includes ...nut-2.7.4/drivers/libusb.h
in addition to installed file /usr/include/libusb-1.0/libusb.h
but gcc doesn't see them.

Is it the intention of the 2.7.4 tarball that ./configure, make and make 
install as described in INSTALL should produce a full rather than a 
crippled nut?

There must be something simple and obvious that I'm missing here.  Any 
hint or pointer would be much appreciated.

Roger