everything seems to work, but php segfaults afterwards.

How I compiled it:

./configure --with-apxs2=/usr/local/sbin/apxs --with-tsrm-pth \
--with-config-file-path=/usr/local/etc --enable-versioning --with-regex=system \
--with-gd=/usr/local --enable-gd-native-ttf \
--with-freetype-dir=/usr/local --with-jpeg-dir=/usr/local \
--with-png-dir=/usr/local --with-zlib --with-bz2=/usr --with-mcrypt=/usr/local \
--with-mhash=/usr/local --with-pdflib=/usr/local --with-zlib-dir=/usr \
--with-jpeg-dir=/usr/local --with-png-dir=/usr/local --with-tiff-dir=/usr/local\
--with-imap=/usr/local --with-mysql=/usr/local --with-ldap=/usr/local \
--with-snmp=/usr/local --enable-ucd-snmp-hack \
--with-openssl=/usr --with-expat-dir=/usr/local --enable-ftp \
--with-iconv=/usr/local --enable-sockets --enable-sysvsem --enable-sysvshm \
--enable-trans-sid --prefix=/usr/local --with-gettext

gdb backtrace:

#0  0x813cccd in _efree (ptr=0x81ac30c)
    at /usr/home/danne/tmp/php-4.3.0RC2/Zend/zend_alloc.c:229
229             REMOVE_POINTER_FROM_LIST(p);
(gdb) back
#0  0x813cccd in _efree (ptr=0x81ac30c)
    at /usr/home/danne/tmp/php-4.3.0RC2/Zend/zend_alloc.c:229
#1  0x814aaa5 in _zval_dtor (zvalue=0x82573c0)
    at /usr/home/danne/tmp/php-4.3.0RC2/Zend/zend_variables.c:44
#2  0x81423c6 in free_zend_constant (c=0x82573c0)
    at /usr/home/danne/tmp/php-4.3.0RC2/Zend/zend_constants.c:31
#3  0x8150063 in zend_hash_destroy (ht=0x81a8180)
    at /usr/home/danne/tmp/php-4.3.0RC2/Zend/zend_hash.c:543
#4  0x8142798 in zend_shutdown_constants ()
    at /usr/home/danne/tmp/php-4.3.0RC2/Zend/zend_constants.c:151
#5  0x814b6fd in zend_shutdown ()
    at /usr/home/danne/tmp/php-4.3.0RC2/Zend/zend.c:552
#6  0x8123d5f in php_module_shutdown ()
    at /usr/home/danne/tmp/php-4.3.0RC2/main/main.c:1196
#7  0x81653bc in main (argc=6, argv=0xbfbff5f4)
    at /usr/home/danne/tmp/php-4.3.0RC2/sapi/cli/php_cli.c:809
#8  0x806c4c9 in _start ()