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'