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