warning in ./configure generated by phpize

When I run ./configure script generated by phpize, it shows us a warning. [kaigai@saba selinux]$ phpize Configuring for: PHP Api Version: 20041225 Zend Module Api No: 20060613 Zend Extension Api No: 220060519 [kaigai@saba selinux]$ ./configure --enable-selinux checking for grep that handles long lines and -e... /bin/grep checking for egrep... /bin/grep -E : checking for PHP installed headers prefix... /usr/include/php checking for re2c... no configure: WARNING: You will need re2c 0.12.0 or later if you want to regenerate PHP parsers. checking for gawk... gawk : configure: creating ./config.status config.status: creating config.h [kaigai@saba selinux]$ It notices "re2c" could not found, but unnecessary as far as the module does not want to regenerate PHP parsers. The selinux module does not need to touch PHP parsers. Is it possible to consider it is a ignorable warning? Thanks, ---- config.m4 ------------ PHP_ARG_ENABLE(selinux,whether to enable libselinux binding support, [ --enable-selinux Enable SELinux support]) if test "$PHP_SELINUX" != "no"; then PHP_NEW_EXTENSION(selinux, selinux.c, $ext_shared) AC_CHECK_LIB(selinux, is_selinux_enabled, AC_DEFINE(HAVE_SELINUX,1, [Enable PHP/SELinux binding]) PHP_ADD_LIBRARY_WITH_PATH(selinux), AC_MSG_ERROR("libselinux is not available hoge")) fi --------------------------- Thanks, -- OSS Platform Development Division, NEC KaiGai Kohei <kaigai@ak.jp.nec.com>