When compiling apache/php4b4-dev/mod_perl-1.21 w/o using DSO - apache crashes after having read the request. The gdb backtrace shows:

Compile environment:
  PHP4: ./configure --with-pgsql --with-apache=../apache_1.3.9 --enable-track-vars --with-gd=/home/sauron/mrtg/gd1.3 --with-zlib --enable-debug --enable-debugger
  APACHE: ./configure --enable-module=unique_id --enable-module=rewrite --enable-module=digest --enable-module=info --activate-module=src/modulesperl/libperl.a --activate-module=src/modules/php4/libphp4.a
  MOD_PERL: perl Makefile.PL APACHE_SRC=../apache_1.3.9/src DO_HTTPD=1 USE_APACI=1 PREP_HTTPD=1 EVERYTHING=1

Debugging:
[root@morannon bin]# gdb /usr/local/bin/httpd
(gdb) run -f /home/httpd/conf/httpd.conf -X
Program received signal SIGSEGV, Segmentation fault.
Starting program: /usr/local/bin/httpd -f /home/httpd/conf/httpd.conf -X

0x80ad40a in do_end_variable_parse (type=0, arg_offset=0) at zend_compile.c:525
525             le = fetch_list_ptr->head;
(gdb) bt
#0  0x80ad40a in do_end_variable_parse (type=0, arg_offset=0)
    at zend_compile.c:525
#1  0x80adff9 in do_return (expr=0xbfffd7e4) at zend_compile.c:976
#2  0x80f98c9 in zendparse ()
    at /home/sauron/updates/php4/./libzend/zend-parser.y:184
#3  0x80babfc in require_file (file_handle=0xbfffe4fc, unique=0)
    at /home/sauron/updates/php4/./libzend/zend-scanner.l:544
#4  0x80ba9e7 in require_filename (filename=0x8308d00 "db_pgsql.inc")
    at /home/sauron/updates/php4/./libzend/zend-scanner.l:486
#5  0x80f98e5 in zendparse ()
    at /home/sauron/updates/php4/./libzend/zend-parser.y:190
#6  0x80ba69c in v_compile_files (mark_as_ref=0, file_count=3,
    files=0xbffff4e0) at /home/sauron/updates/php4/./libzend/zend-scanner.l:355
#7  0x80ba5d2 in compile_files (mark_as_ref=0, file_count=3)
    at /home/sauron/updates/php4/./libzend/zend-scanner.l:325
#8  0x80a79a3 in php_execute_script (primary_file=0xbffff540) at main.c:1281
#9  0x80be1b1 in apache_php_module_main (r=0x8300764, fd=33,
    display_source_mode=0) at sapi_apache.c:87
#10 0x80a60c3 in send_php ()
#11 0x80a6108 in send_parsed_php ()
#12 0x811fdb3 in ap_invoke_handler ()
#13 0x81330a9 in process_request_internal ()
#14 0x81334c8 in ap_internal_redirect ()
#15 0x8080d3d in handle_dir ()
#16 0x811fdb3 in ap_invoke_handler ()
#17 0x81330a9 in process_request_internal ()
#18 0x813310c in ap_process_request ()
#19 0x812aace in child_main ()
#20 0x812ac5c in make_child ()
#21 0x812adb9 in startup_children ()
#22 0x812b3e6 in standalone_main ()
#23 0x812bb63 in main ()
#24 0x40103cb3 in __libc_start_main (main=0x812b82c <main>, argc=4,
    argv=0xbffff774, init=0x806dc4c <_init>, fini=0x81bca5c <_fini>,
    rtld_fini=0x4000a350 <_dl_fini>, stack_end=0xbffff76c)
    at ../sysdeps/generic/libc-start.c:78
(gdb) list
520             zend_llist_element *le;
521             zend_op *opline, *opline_ptr;
522
523             zend_stack_top(&CG(bp_stack), (void **) &fetch_list_ptr);
524
525             le = fetch_list_ptr->head;
526
527             while (le) {
528                     opline_ptr = (zend_op *)le->data;
529                     opline = get_next_op(CG(active_op_array) CLS_CC);
(gdb) info locals
fetch_list_ptr = (zend_llist *) 0x0
le = (zend_llist_element *) 0x8318e30
opline = (zend_op *) 0x1aa
opline_ptr = (zend_op *) 0xbfffd7e4

Obviously it's crashing because fetch_list_ptr is 0x0 - why this is occurring, I don't know.

Thanks in advance,
Dominic