mcrypt

hi al, when i was trying to compile php 3 or 4 i got these errorr msgs . can anyone help me ? these errors are too longs . mcrypt.c:154: warning: pas sing arg 3 of `zend_register_long_constant' makes integer from pointer without a cast mcrypt.c:155: `MCRYPT_RC2_256' undeclared (first use in this function) mcrypt.c:156: `MCRYPT_RC2_128' undeclared (first use in this function) mcrypt.c:157: `MCRYPT_RC6_256' undeclared (first use in this function) mcrypt.c:158: `MCRYPT_IDEA' undeclared (first use in this function) mcrypt.c:159: `MCRYPT_RC6_128' undeclared (first use in this function) mcrypt.c:160: `MCRYPT_RC6_192' undeclared (first use in this function) mcrypt.c:161: `MCRYPT_RC4' undeclared (first use in this function) mcrypt.c: In function `php_if_mcrypt_get_cipher_name': mcrypt.c:236: warning: implicit declaration of function `mcrypt_get_algorithms_name' mcrypt.c:236: warning: assignment makes pointer from integer without a cast mcrypt.c: In function `php_if_mcrypt_get_key_size': mcrypt.c:258: warning: implicit declaration of function `mcrypt_get_key_size' mcrypt.c: In function `php_if_mcrypt_get_block_size': mcrypt.c:273: warning: implicit declaration of function `mcrypt_get_block_size' mcrypt.c: In function `php_if_mcrypt_ofb': mcrypt.c:290: warning: implicit declaration of function `init_mcrypt_ofb' mcrypt.c:292: warning: implicit declaration of function `mcrypt_ofb' mcrypt.c:292: warning: implicit declaration of function `mdecrypt_ofb' mcrypt.c:292: warning: implicit declaration of function `end_mcrypt_ofb' mcrypt.c: In function `php_if_mcrypt_get_cipher_name': mcrypt.c:236: warning: implicit declaration of function `mcrypt_get_algorithms_name'