pear install pdflib

[root@marytooker src]# pear install pdflib
downloading pdflib-2.0.5.tgz ...
Starting to download pdflib-2.0.5.tgz (36,505 bytes)
..........done: 36,505 bytes
7 source files, building
running: phpize
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-aclocal
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
/usr/share/aclocal/z-ac_withnone.m4:3: warning: underquoted definition of AC_WITHNONE_IF
/usr/share/aclocal/z-ac_withnone.m4:16: warning: underquoted definition of AC_SUBST_WITHOUT
/usr/share/aclocal/z-ac_subdir_files.m4:15: warning: underquoted definition of AC_SUBDIR_FILES
/usr/share/aclocal/z-ac_prog_cp_s.m4:25: warning: underquoted definition of AC_PROG_CP_S
/usr/share/aclocal/z-ac_define_versionlevel.m4:40: warning: underquoted definition of AC_DEFINE_VERSIONLEVEL
/usr/share/aclocal/z-ac_cond_with_level.m4:30: warning: underquoted definition of AC_COND_WITH_LEVEL
/usr/share/aclocal/z-ac_cond_with_level.m4:84: warning: underquoted definition of AC_COND_WITH_LEVEL_DEFINE
/usr/share/aclocal/z-ac_check_typedef.m4:15: warning: underquoted definition of AC_CHECK_TYPEDEF_
/usr/share/aclocal/z-ac_check_typedef.m4:34: warning: underquoted definition of AC_CHECK_TYPEDEF
/usr/share/aclocal/z-ac_check_symbol.m4:11: warning: underquoted definition of AC_CHECK_SYMBOL
/usr/share/aclocal/z-ac_check_symbol.m4:38: warning: underquoted definition of AC_CHECK_SYMBOLS
/usr/share/aclocal/z-ac_check_func_in.m4:8: warning: underquoted definition of AC_CHECK_FUNC_IN
/usr/share/aclocal/z-ac_check_func_in.m4:48: warning: underquoted definition of AC_CHECK_FUNCS_IN
/usr/share/aclocal/z-ac_check_cc_opt.m4:18: warning: underquoted definition of AC_CHECK_CC_OPT
/usr/share/aclocal/z-ac_caolan_func_which_gethostbyname_r.m4:20: warning: underquoted definition of AC_caolan_FUNC_WHICH_GETHOSTBYNAME_R
/usr/share/aclocal/z-ac_arg_with_path_style.m4:29: warning: underquoted definition of AC_ARG_WITH_PATH_STYLE
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
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Can someone help with this problem????