ldd -d libphp5.so resulting multiple undefined symbol errors. How to fix the same?

Question

Installed Apache 2.4.54 and PHP 5.6.32 from the source.

Here are the configure options used.

Apache:

./configure \
        --prefix=${APACHE_PREFIX} \
        --enable-module=most \
        --enable-rewrite \
        --enable-auth-digest \
        --enable-ssl \
        --with-openssl-dir=${OPENSSL} \
        --with-included-apr \
        --enable-lib64 \
        --with-httpd24 \
        --enable-mbstring \
        --enable-so \
        --with-mpm=worker \
        --enable-cgi

And PHP:

./configure \
        --prefix=${PHP_PREFIX} \
        --with-config-file-path=${PHP_PREFIX}/lib \
        --with-tsrm-pthreads \
        --disable-short-tags \
        --enable-mbstring \
        --enable-opcache \
        --with-xsl=${LIBXSLT_PREFIX} \
        --with-zlib=${ZLIB_PREFIX} \
        --with-openssl-dir=${OPENSSL} \
        --with-ssl \
        --with-gd

The installation is successful.

There is shared object file libphp5.so got created under apache2_installation/modules directory.

When apachectl -M is executed, it says php5_module is loaded.

When apachectl -t is executed, it says Syntax OK`.

However, when ldd -d libphp5.so is executed, it says:

undefined symbol: ap_server_root    (./libphp5.so)
undefined symbol: apr_pool_cleanup_null (./libphp5.so)
undefined symbol: ap_unixd_config   (./libphp5.so)
undefined symbol: ap_loaded_modules (./libphp5.so)

Thought, I might have missed something. Then tried docker image php:5.6-apache. And still result is same.

When libphp5.so is used as dependency in other sources, I am running into above issue. And unable to proceed.

Just looking for way to overcome the above undefined symbol issues, searched a lot with futile.

Appreciate any help!

EDIT:

Found this link which says to use Apache 2.2 but I had to use with TLS v1.3.