./configure pb or faulty configure.in?

[messmate <messmate@free.fr>]

Hi,
i've to compile 'gshieldconf-0.40 on my sarge.
On the configure 
the following messages appears :

loading cache ./config.cache
checking for a BSD compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking whether make sets ${MAKE}... yes
checking for working aclocal... found
checking for working autoconf... found
checking for working automake... found
checking for working autoheader... found
checking for working makeinfo... found
checking for gcc... gcc
checking whether the C compiler (gcc  ) works... yes
checking whether the C compiler (gcc  ) is a cross-compiler... no
checking whether we are using GNU C... yes
checking whether gcc accepts -g... yes
checking for POSIXized ISC... no
checking for gcc... (cached) gcc
checking whether the C compiler (gcc -g -O2 ) works... yes
checking whether the C compiler (gcc -g -O2 ) is a cross-compiler... no
checking whether we are using GNU C... (cached) yes
checking whether gcc accepts -g... (cached) yes
checking for gcc option to accept ANSI C... none needed
checking how to run the C preprocessor... gcc -E
checking for ANSI C header files... yes
checking for gtk-config... /usr/bin/gtk-config
checking for GTK - version >= 1.2.0... yes
checking for xml-config... no
checking for libxml... checking for xml2-config... (cached) no
checking for libxml2... no
*** Could not find libxml.  Check out the libxml homepage at
*** http://www.xmlsoft.org or just get
*** the appropriate package for your system.
configure: error: libxml needed

This seems that xml2-config isn't found !
But it's there :
locate xml2-config
/usr/bin/xml2-config
/usr/share/man/man1/xml2-config.1.gz

So what happen exactly ? 
PATH is set :
echo $PATH
/sbin:/usr/sbin:/bin:/usr/bin:/usr/X11R6/bin:/usr/local/bin:/usr/local/
sbin:/usr/libexec:/usr/local/kde/bin:/usr/games

Thanks in advance four your help


-- 
Amicalement
mess-mate