Sorry people, I'm not so expert. :-) I was trying to compile php as self executable with this configure options:

./configure \
--prefix=/usr/local/php' \
--with-config-file-path=/etc' \
--enable-pic \
--enable-shared \
--enable-inline-optimization \
--with-regex=system \
--with-gettext \
--with-zlib \
--enable-debugger \
--enable-magic-quotes \
--enable-sockets \
--enable-sysvsem \
--enable-sysvshm \
--enable-track-vars \
--enable-ftp \
--enable-wddx \
--with-xml

--- make command fails with this error: -------------
Undefined                       first referenced
 symbol                             in file
php_regerror                        ./.libs/libphp4.a(reg.lo)
core_globals                        ./.libs/libphp4.a(cgi_main.o)
php_regexec                         ./.libs/libphp4.a(browscap.lo)
php_regcomp                         ./.libs/libphp4.a(browscap.lo)
compiler_globals                    ./.libs/libphp4.a(cgi_main.o)
executor_globals                    ./.libs/libphp4.a(cgi_main.o)
sapi_globals                        ./.libs/libphp4.a(cgi_main.o)
php_regfree                         ./.libs/libphp4.a(browscap.lo)
ld: fatal: Symbol referencing errors. No output written to php
collect2: ld returned 1 exit status
*** Error code 1
make: Fatal error: Command failed for target `php'
Current working directory /export/home/source/php-4.2.3
*** Error code 1
make: Fatal error: Command failed for target `all-recursive'