buildconf anc configure work fine. With this config:

./configure --with-mysql=/usr/local --with-pdflib 
--enable-exif --with-bz2 --with-zlib --with-openssl 
--with-gettext --with-ldap --with-mhash --disable-overload 
--enable-sockets --with-vpopmail --with-mcrypt 
--enable-sysvshm --enable-pcntl 
--with-config-file-path=/var/www/conf/php43/ 
--enable-mbstring --with-pear=/usr/local/lib/php

I get this error on make:

gcc  -Iext/standard/ -I/usr/local/src/php4/ext/standard/ 
-DPHP_ATOM_INC -I/usr/local/src/php4/include 
-I/usr/local/src/php4/main -I/usr/local/src/php4 
-I/usr/local/src/php4/Zend -I/usr/local/include 
-I/usr/local/include/mysql 
-I/usr/local/src/php4/ext/xml/expat  
-I/usr/local/src/php4/TSRM  -g -O2  -c 
/usr/local/src/php4/ext/standard/basic_functions.c -o 
ext/standard/basic_functions.o  && echo > 
ext/standard/basic_functions.lo
/usr/local/src/php4/ext/standard/basic_functions.c:1377: 
warning: `struct option' declared inside parameter list
/usr/local/src/php4/ext/standard/basic_functions.c:1377: 
warning: its scope is only this definition or declaration, 
which is probably not what you want.
/usr/local/src/php4/ext/standard/basic_functions.c: In 
function `free_longopts':
/usr/local/src/php4/ext/standard/basic_functions.c:1382: 
dereferencing pointer to incomplete type
/usr/local/src/php4/ext/standard/basic_functions.c:1382: 
increment of pointer to unknown structure
/usr/local/src/php4/ext/standard/basic_functions.c:1382: 
arithmetic on pointer to an incomplete type
/usr/local/src/php4/ext/standard/basic_functions.c:1383: 
dereferencing pointer to incomplete type
/usr/local/src/php4/ext/standard/basic_functions.c: In 
function `zif_getopt':
/usr/local/src/php4/ext/standard/basic_functions.c:1458: 
sizeof applied to an incomplete type
/usr/local/src/php4/ext/standard/basic_functions.c:1470: 
dereferencing pointer to incomplete type
/usr/local/src/php4/ext/standard/basic_functions.c:1474: 
dereferencing pointer to incomplete type
/usr/local/src/php4/ext/standard/basic_functions.c:1477: 
dereferencing pointer to incomplete type
/usr/local/src/php4/ext/standard/basic_functions.c:1482: 
dereferencing pointer to incomplete type
/usr/local/src/php4/ext/standard/basic_functions.c:1483: 
dereferencing pointer to incomplete type
/usr/local/src/php4/ext/standard/basic_functions.c:1484: 
dereferencing pointer to incomplete type
/usr/local/src/php4/ext/standard/basic_functions.c:1487: 
increment of pointer to unknown structure
/usr/local/src/php4/ext/standard/basic_functions.c:1487: 
arithmetic on pointer to an incomplete type
/usr/local/src/php4/ext/standard/basic_functions.c:1519: 
arithmetic on pointer to an incomplete type
/usr/local/src/php4/ext/standard/basic_functions.c:1519: 
dereferencing pointer to incomplete type
/usr/local/src/php4/ext/standard/basic_functions.c:1548: 
warning: passing arg 1 of `free_longopts' from incompatible 
pointer type
*** Error code 1

Stop in /usr/local/src/php4 (line 428 of Makefile).