Please try using this CVS snapshot:

  http://snaps.php.net/php4-STABLE-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php4-win32-STABLE-latest.zip

Ok tried latest snapshot. The bug still not fixed.
./configure fails due to wrong oracle library model
chosen, please see the config.log entry:

configure:67926: checking for fork
configure:67954: gcc -o conftest -DEAPI  -D_POSIX_PTHREAD_SEMANTICS -L/usr/local/BerkeleyDB.3.3/lib  -R/usr/ucblib -L/usr/ucblib -R/usr/local/lib/gcc-lib/sparc-sun-solaris2.9/3.3.1 -L/usr/local/lib/gcc-lib/sparc-sun-solaris2.9/3.3.1 -R/usr/local/ssl/lib -L/usr/local/ssl/lib -R/usr/local/lib -L/usr/local/lib -R/usr/local/BerkeleyDB.3.3/lib -L/usr/local/BerkeleyDB.3.3/lib -R/export/home/rvs/src/imap-2002e/lib -L/export/home/rvs/src/imap-2002e/lib -R/oracle/orahome/oracle9i/lib -L/oracle/orahome/oracle9i/lib conftest.c -lsybdb -lmcrypt -lltdl -lldap -llber -lcrypt -lpam -liconv -lintl -lgd -lz -ldb-3.3 -ldb-3.3 -lcurl -lz -lssl -lcrypto -lresolv -lm -ldl -lnsl -lsocket  -lgcc -lcurl -lz -lssl -lcrypto -ldl -lsocket -lnsl -lz -lxml2 -lz -liconv -lm -lsocket -lnsl -lnsl -lsocket -lgen -ldl -lclntsh 1>&5
ld: fatal: file /oracle/orahome/oracle9i/lib/libclntsh.so: wrong ELF class: ELFCLASS64
ld: fatal: File processing errors. No output written to conftest
collect2: ld returned 1 exit status
configure: failed program was:
#line 67931 "configure"
#include "confdefs.h"
/* System header to define __stub macros and hopefully few prototypes,
    which can conflict with char fork(); below.  */
#include <assert.h>
/* Override any gcc2 internal prototype to avoid an error.  */
/* We use char because int might match the return type of a gcc2
    builtin and then its argument prototype would still apply.  */
char fork();

int main() {

/* The GNU C library defines this for functions which it implements
    to always fail with ENOSYS.  Some functions are actually named
    something starting with __ and the normal name is an alias.  */
#if defined (__stub_fork) || defined (__stub___fork)
choke me
#else
fork();
#endif

; return 0; }

The patch mentioned in #29402 will not be backported to 4.3.x branch, so you need to figure out where your libs are and change "/lib" in ext/oci8/config.m4 to the right dir ("/lib32", probably ?). Run ./buildconf after that and it should work.
Tell me if something will go wrong.

OR you can get latest stable 5.0.x release and it will work for you without any modifications.

Ok this modification method works,
it's a pity that no permanent patch
will be provided for 4.3.x...
Suggest to mark this bug RESOLVED.

The bug seems to be resolved.