Here you are:
./configure  --prefix=/opt/php4 --with-apxs=/opt/apache/bin/apxs --sysconfdir=/opt/etc/php4 --with-config-file-path=/opt/etc/php4 --disable-debug --with-gd=shared --with-jpeg-dir=/usr/sfw --with-png-dir=/usr/sfw --with-zlib=shared --with-imap=shared,/usr/local/src/imap-2002e --with-mysql=shared,/opt/mysql --with-mysql-sock=/var/run/mysql/sock --enable-dba=shared --with-db4=shared,/usr/local --with-ndbm=shared --with-ldap=shared,/usr/local --with-openssl=/usr/local/ssl --with-gettext --with-pear --enable-safe-mode --enable-bcmath=shared --enable-calendar=shared --enable-ftp=shared --enable-sysvmsg --enable-sysvsem --enable-sysvshm --with-mcrypt=shared --with-xml=shared --with-dom=shared --enable-mime-magic --with-iconv=shared --with-mbstring=all

Try giving the prefix of iconv library to the configure 
option, like --with-iconv=shared,/usr/local

Why should this be needed. I haven't installed any libiconv in /usr/local. Solaris provides the iconv in libc and the headers are in /usr/include/iconv.h

see also bug #25281

It's me again.
I just compiled everything static.
running the script form commandline doesn't segfault anymore, but the apache1 module still segfaults!
gdb showed:
(gdb) run -X
Starting program: /opt/apache/bin/httpd -X
warning: Lowest section in /usr/lib/libintl.so.1 is .hash at 00000074
warning: Lowest section in /usr/lib/libintl.so.1 is .hash at 00000074
 
Program received signal SIGSEGV, Segmentation fault.
0xfddb4624 in shutdown_memory_manager (silent=1, clean_cache=18432) at /usr/local/src/php-4.3.4/Zend/zend_alloc.c:531
531                             REMOVE_POINTER_FROM_LIST(t);
(gdb) bt
#0  0xfddb4624 in shutdown_memory_manager (silent=1, clean_cache=18432) at /usr/local/src/php-4.3.4/Zend/zend_alloc.c:531
#1  0xfdd94980 in php_request_shutdown (dummy=0x0) at /usr/local/src/php-4.3.4/main/main.c:1005
#2  0xfddd577c in apache_php_module_main (r=0x0, display_source_mode=-35825944) at /usr/local/src/php-4.3.4/sapi/apache/sapi_apache.c:60

Try this:

# rm config.cache
# ./configure --with-apxs=/opt/apache/bin/apxs --disable-all
# make clean && make

And as that most likely works fine, add the other options one by one to see which one actually causes the problem.

The problem occurs when enabling iconv or mbstring

Are you still loading any shared extensions? 
Check your php.ini..

Also confirm if this configure line works / does not work:

# ./configure --disable-all --with-apxs=/opt/apache/bin/apxs --enable-mbstring=all

No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Open". Thank you.

Hi!
Sorry, I had no spare time to do some more debugging. Now back online :-)

I cannot confirm the bug with only using --enable-mbstring or --with-iconv...

I only encounter the bug when testing the horde-Framework from CVS. I was not able to create a php script that crashed. But everytime I call 'php login.php' from horde there is a segfault. the same with the apache 1.x module.

I don't know how to go on.

Yours Joerg

Come back when you have short example script (other than Horde), or preferrably: Ask the horde authors to come up with the script.