Cannot configure PHP from source to use the desired Kerberos library path

Description

On Oracle Linux 8
I configure, make and make install my Kerberos library as follows

./configure --prefix=/kerberos-1.21.3 --enable-dns-for-realm

The above creates the folder /kerberos-1.21.3/lib with all my libraries in it.

I manually amend all /kerberos-1.21.3/lib/pkgconfig/*.pc files to contain the value libdir=/library

I then relocate an entire copy of the created library folder to my desired library location /library as follows:

cp /kerberos-1.21.3/lib/* /library

I "configure", "make" and "make install" PHP, with configure looking as follows:

env LD_LIBRARY_PATH=/library PKG_CONFIG=/usr/bin/pkg-config PKG_CONFIG_PATH=/library/pkgconfig KERBEROS_LIBS="-L/library -Wl,-rpath,/library" KERBEROS_CFLAGS="-I/kerberos-1.21.3/include" ./configure --prefix=/myphp --with-kerberos

Everything completes as normal.

As can be seen above, the environment I have set is:

• LD_LIBRARY_PATH=/library
• PKG_CONFIG_PATH=/library/pkgconfig
• KERBEROS_LIBS="-L/library -Wl,-rpath,/library"
• KERBEROS_CFLAGS="-I/kerberos-1.21.3/include"

This points all library information to the /library directory, and only the include header files directory to my original kerberos build location (via KERBEROS_CFLAGS and the /library/pkgconfig/*.pc files includedir= value)

All the documentation I have read says that with my configuration above, running ldd /myphp/bin/php should report as:

libkrb5.so.3 => /library/libkrb5.so.3

but when I run it, for libkrb5.so.3 I get the following:

libkrb5.so.3 => /kerberos-1.21.3/lib/libkrb5.so.3

Why am I getting the wrong -ie. original build - library location? I am literally tearing my hair out with this. Thanks

PHP Version

php 8.2.22

Operating System

Oracle Linux 8.10

Reproduce the reported PHP 8.2.22 configuration on Oracle Linux 8.10 using the supplied Kerberos paths and environment variables, then inspect the configure output and the linked libraries reported by ldd /myphp/bin/php. Done would require determining why the original /kerberos-1.21.3/lib path is retained and identifying a documented or actionable correction.