error when use phpize
 

I got this error
trying install libtool gcc gtk but not fix it
Im use Centos Os 4.3
$PHP_PREFIX/bin/phpize
configure.in:9: warning: underquoted definition of PHP_WITH_PHP_CONFIG
run info '(automake)Extending aclocal'
or see
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