I've installed mcrypt 2.4.10 (yes, I used --disable-posix-threads)

I need to compile PHP3 (yes, I need PHP3, not PHP4). The ./configure (LIBS="-ljpeg -lgssapi_krb5 -lkrb5 -lk5crypto -L/usr/kerberos/lib/" ./configure --with-gd=/usr/local --with-apxs=/u/httpd/bin/apxs --with-mysql --enable-versioning --with-ttf --with-jpeg-dir=/usr --with-imap --with-xml --with-kerberos --with-mcrypt=/usr --with-mhash=/usr) gives no error, however, when I compile, I get a whole bunch or errors :

[snip]
gcc -g -O2 -DLINUX=2 -DMOD_SSL=206103 -DUSE_HSREGEX -DEAPI -DUSE_EXPAT -I../lib/expat-lite -O2 -fpic -DSHARED_MODULE  -I. -I.   -I/u/httpd/include                  -I/usr/include/imap -I/usr/local/include -I/usr/local/include/mysql -I/u/httpd/include    -c functions/mcrypt.c -o functions/mcrypt.o
functions/mcrypt.c:120: warning: `MCRYPT_FAILED' redefined
/usr/include/mcrypt.h:30: warning: this is the location of the previous definition
functions/mcrypt.c: In function `php_minit_mcrypt':
functions/mcrypt.c:139: `MCRYPT_BLOWFISH_448' undeclared (first use in this function)
functions/mcrypt.c:139: (Each undeclared identifier is reported only once
functions/mcrypt.c:139: for each function it appears in.)
functions/mcrypt.c:140: warning: passing arg 3 of `php3_register_long_constant' makes integer from pointer without a cast
functions/mcrypt.c:141: warning: passing arg 3 of `php3_register_long_constant' makes integer from pointer without a cast
functions/mcrypt.c:142: warning: passing arg 3 of `php3_register_long_constant' makes integer from pointer without a cast
functions/mcrypt.c:143: warning: passing arg 3 of `php3_register_long_constant' makes integer from pointer without a cast
functions/mcrypt.c:144: `MCRYPT_SAFER_64' undeclared (first use in this function)
functions/mcrypt.c:145: `MCRYPT_SAFER_128' undeclared (first use in this function)
functions/mcrypt.c:146: warning: passing arg 3 of `php3_register_long_constant' makes integer from pointer without a cast
functions/mcrypt.c:147: warning: passing arg 3 of `php3_register_long_constant' makes integer from pointer without a cast
functions/mcrypt.c:148: `MCRYPT_RC2_1024' undeclared (first use in this function)
functions/mcrypt.c:149: `MCRYPT_TWOFISH_128' undeclared (first use in this function)
functions/mcrypt.c:150: `MCRYPT_TWOFISH_192' undeclared (first use in this function)
functions/mcrypt.c:151: `MCRYPT_TWOFISH_256' undeclared (first use in this function)
functions/mcrypt.c:152: `MCRYPT_BLOWFISH_128' undeclared (first use in this function)
functions/mcrypt.c:153: `MCRYPT_BLOWFISH_192' undeclared (first use in this function)
functions/mcrypt.c:154: `MCRYPT_BLOWFISH_256' undeclared (first use in this function)
functions/mcrypt.c:155: warning: passing arg 3 of `php3_register_long_constant' makes integer from pointer without a cast
functions/mcrypt.c:156: warning: passing arg 3 of `php3_register_long_constant' makes integer from pointer without a cast
functions/mcrypt.c:157: warning: passing arg 3 of `php3_register_long_constant' makes integer from pointer without a cast
functions/mcrypt.c:158: `MCRYPT_SERPENT_128' undeclared (first use in this function)
functions/mcrypt.c:159: `MCRYPT_SERPENT_192' undeclared (first use in this function)
functions/mcrypt.c:160: `MCRYPT_SERPENT_256' undeclared (first use in this function)
functions/mcrypt.c:161: warning: passing arg 3 of `php3_register_long_constant' makes integer from pointer without a cast
functions/mcrypt.c:162: warning: passing arg 3 of `php3_register_long_constant' makes integer from pointer without a cast
functions/mcrypt.c:163: warning: passing arg 3 of `php3_register_long_constant' makes integer from pointer without a cast
functions/mcrypt.c:164: `MCRYPT_RC2_256' undeclared (first use in this function)
functions/mcrypt.c:165: `MCRYPT_RC2_128' undeclared (first use in this function)
functions/mcrypt.c:166: `MCRYPT_RC6_256' undeclared (first use in this function)
functions/mcrypt.c:167: `MCRYPT_IDEA' undeclared (first use in this function)
functions/mcrypt.c:168: `MCRYPT_RC6_128' undeclared (first use in this function)
functions/mcrypt.c:169: `MCRYPT_RC6_192' undeclared (first use in this function)
functions/mcrypt.c:170: `MCRYPT_RC4' undeclared (first use in this function)
functions/mcrypt.c: In function `php3_mcrypt_get_cipher_name':
functions/mcrypt.c:243: warning: assignment makes pointer from integer without a cast
make: *** [functions/mcrypt.o] Error 1