sane-backend fail, though libusb is installed

gistfile1.txt

brew install sane-backends 
==> Downloading ftp://ftp2.sane-project.org/pub/sane/sane-backends-1.0.22/sane-backends-1.0.22.tar.gz
File already downloaded in /Users/bmix/Library/Caches/Homebrew
==> ./configure --prefix=/usr/local/Cellar/sane-backends/1.0.22 --without-gphoto2 --enable-local-backends --enable-libusb --disable-latex
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... ./install-sh -c -d
checking for gawk... no
checking for mawk... no
checking for nawk... no
checking for awk... awk
checking whether make sets $(MAKE)... yes
checking whether to enable maintainer-specific portions of Makefiles... no
checking build system type... i386-apple-darwin10.8.0
checking host system type... i386-apple-darwin10.8.0
checking for gcc... /usr/bin/gcc-4.2
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether /usr/bin/gcc-4.2 accepts -g... yes
checking for /usr/bin/gcc-4.2 option to accept ISO C89... none needed
checking for style of include used by make... GNU
checking dependency style of /usr/bin/gcc-4.2... none
checking whether /usr/bin/gcc-4.2 and cc understand -c and -o together... yes
checking whether make sets $(MAKE)... (cached) yes
checking how to run the C preprocessor... /usr/bin/gcc-4.2 -E
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking whether /usr/bin/gcc-4.2 needs -traditional... no
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checking pkg-config is at least version 0.9.0... yes
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checking for stdint types... stdint.h (shortcircuit)
make use of stdint.h in include/_stdint.h (assuming C99 compatible system)
checking dlfcn.h usability... yes
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checking dl.h usability... no
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checking for sqrt in -lm... yes
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checking jconfig.h usability... yes
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checking for jpeglib - version >= 61 (6a)... yes
checking for TIFFFdOpen in -ltiff... yes
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configure: WARNING: Group uucp does not exist on this system.
configure: WARNING: Locking feature will be disabled.
checking whether to enable device locking... no
checking for LIBV4L... no
checking for sane_init in -lsane... no
checking for net-snmp-config... /usr/bin/net-snmp-config
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configure: WARNING: You need at least net-snmp 5.6, your version is 5.4.2.1
configure: WARNING: *** Warning: net-snmp library disabled, autodetecting network scanners will not be supported.
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checking for usb_interrupt_read in -lusb... no
configure: error: USB support requested but required libraries not found.
==> Exit Status: 1
http://github.com/mxcl/homebrew/blob/master/Library/Formula/sane-backends.rb#L16
==> Environment
HOMEBREW_VERSION: 0.8
HEAD: ecc162613d2e103a8785cb05aac95041332a41b4
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
HOMEBREW_REPOSITORY: /usr/local
HOMEBREW_LIBRARY_PATH: /usr/local/Library/Homebrew
Hardware: dual-core 32-bit core
OS X: 10.6.8
Kernel Architecture: i386
Ruby: 1.8.7-249
/usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
Xcode: 3.2.6
GCC-4.0: build 5494 
GCC-4.2: build 5666 
LLVM: build 2335 
MacPorts or Fink? false
X11 installed? true
==> Build Flags
CC: /usr/bin/gcc-4.2
CXX: /usr/bin/g++-4.2
LD: /usr/bin/gcc-4.2
CFLAGS: -O3 -march=prescott -mfpmath=sse -w -pipe
CXXFLAGS: -O3 -march=prescott -mfpmath=sse -w -pipe

Error: Failed executing: ./configure --disable-dependency-tracking --prefix=/usr/local/Cellar/sane-backends/1.0.22 --without-gphoto2 --enable-local-backends --enable-libusb --disable-latex
If `brew doctor' does not help diagnose the issue, please report the bug:
    https://github.com/mxcl/homebrew/wiki/checklist-before-filing-a-new-issue
We saved the configure log, please gist it if you report the issue:
    ~/Library/Logs/Homebrew/config.log
coca:~ bmix$ brew edit sane-backends
coca:~ bmix$ brew info libusb
libusb 1.0.8
http://www.libusb.org/
/usr/local/Cellar/libusb/1.0.8 (8 files, 292K)
http://github.com/mxcl/homebrew/commits/master/Library/Formula/libusb.rb
coca:~ bmix$ brew info libusb-compat
libusb-compat 0.1.3
http://www.libusb.org/
Depends on: pkg-config, libusb
/usr/local/Cellar/libusb-compat/0.1.3 (10 files, 128K)
http://github.com/mxcl/homebrew/commits/master/Library/Formula/libusb-compat.rb