XMLReader installation

Installing xmlreader 1.0 pecl extension with the command

pear install package.xml

the following error message occurs:


##########################################################################
4 source files, building
running: phpize
Configuring for:
PHP Api Version:         20031224
Zend Module Api No:      20040412
Zend Extension Api No:   220040412
configure.in:9: warning: underquoted definition of PHP_WITH_PHP_CONFIG
  run info '(automake)Extending aclocal'
  or see
http://sources.redhat.com/automake/automake.html#Extending%20aclocal
configure.in:32: warning: underquoted definition of PHP_EXT_BUILDDIR
configure.in:33: warning: underquoted definition of PHP_EXT_DIR
configure.in:34: warning: underquoted definition of PHP_EXT_SRCDIR
configure.in:35: warning: underquoted definition of PHP_ALWAYS_SHARED
acinclude.m4:19: warning: underquoted definition of PHP_PROG_RE2C
acinclude.m4:1903: warning: underquoted definition of PHP_TEST_BUILD
configure.in:65: error: possibly undefined macro: AC_PROG_LIBTOOL
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
`phpize' failed
##########################################################################

could u please give me some hints to solve this problems?
I'm very new to pecl and pear :(   <-- But they're great!

Thanks in advance

vivi