[Php4beta] Faile to compile

here is the error i obtain gcc -DHAVE_CONFIG_H -I. -I/root/temp/php-4.0RC1/ext/standard -I../.. -I../../Zend -I/root/temp/php-4.0RC1 -I/root/temp/apache_1.3.12/src/include -I/root/temp/apache_1.3.12/src/os/unix -I/root/temp/php-4.0RC1/ext/mysql/libmysql -I/root/temp/php-4.0RC1/ext/xml/expat/xmltok -I/root/temp/php-4.0RC1/ext/xml/expat/xmlparse -DXML_BYTE_ORDER=12 -D_REENTRANT -g -O2 -Wall -c microtime.c && touch microtime.lo microtime.c: In function `php_if_getrusage': microtime.c:97: storage size of `usg' isn't known microtime.c:100: `RUSAGE_SELF' undeclared (first use in this function) microtime.c:100: (Each undeclared identifier is reported only once microtime.c:100: for each function it appears in.) microtime.c:106: `RUSAGE_CHILDREN' undeclared (first use in this function) microtime.c:110: warning: implicit declaration of function `getrusage' microtime.c:97: warning: unused variable `usg' make[3]: *** [microtime.lo] Error 1 make[3]: Leaving directory `/root/temp/php-4.0RC1/ext/standard' make[2]: *** [all-recursive] Error 1 make[2]: Leaving directory `/root/temp/php-4.0RC1/ext/standard' make[1]: *** [all] Error 1 make[1]: Leaving directory `/root/temp/php-4.0RC1/ext' make: *** [all-recursive] Error 1 are there possiblle Solutions to this?