“libmysqlclient.so.16: cannot open shared object” when installing PHP

[thomas Armstrong <tarmstrong@xxxxxxxxx>]

Hi.

Trying to install PHP 5.2.17 (with MySQL 5.1.55) on a Linux box:

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# ./configure --prefix=/usr/local/php --with-apxs2=/usr/local/apache2/bin/apxs --with-mysql=/usr/local/mysql
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I get this error within my 'debug.log' file:
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CONFIGURE:   './configure'  '--prefix=/usr/local/php' '--with-apxs2=/usr/local/apache2/bin/apxs' '--with-mysql=/usr/local/mysql'
CC:         gcc
CFLAGS:     -I/usr/include -g -O2
CPPFLAGS:
CXX:
CXXFLAGS:
INCLUDES:    -I/home/pi/lampsources/php-5.2.17/ext/date/lib -I/usr/include/libxml2 -I/usr/local/mysql/include/mysql
LDFLAGS:    -L/usr/lib  -R/usr/local/mysql/lib/mysql -L/usr/local/mysql/lib/mysql
LIBS:       -lcrypt -lrt -lmysqlclient -lrt -lresolv -lm -ldl -lnsl  -lxml2 -lxml2 -lxml2 -lcrypt
DLIBS:
SAPI:       apache2handler
PHP_RPATHS:  /usr/local/mysql/lib/mysql
uname -a:   Linux raspberrypi 4.4.9+ #884 Fri May 6 17:25:37 BST 2016 armv6l GNU/Linux

gcc -o conftest -I/usr/include -g -O2  -L/usr/lib  -R/usr/local/mysql/lib/mysql -L/usr/local/mysql/lib/mysql conftest.c -lcrypt -lrt -lmysqlclient -lrt -lresolv -lm -ldl -lnsl  -lxml2 -lxml2 -lxml2 -lcrypt 1>&5
conftest.c: In function 'main':
conftest.c:3:3: warning: incompatible implicit declaration of built-in function 'exit'
   exit(0);
   ^
./conftest: error while loading shared libraries: libmysqlclient.so.16: cannot open shared object file: No such file or directory
--------------------

If I browse '/usr/local/mysql/include/mysql' contents:
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# cd /usr/local/mysql/lib/mysql
# ls -l
total 11736
-rw-r--r-- 1 root staff    7450 Jun  7 22:27 libdbug.a
-rw-r--r-- 1 root staff  521222 Jun  7 22:28 libheap.a
-rw-r--r-- 1 root staff 2438930 Jun  7 22:28 libmyisam.a
-rw-r--r-- 1 root staff  735778 Jun  7 22:28 libmyisammrg.a
-rw-r--r-- 1 root staff 1762244 Jun  7 22:27 libmysqlclient.a
-rwxr-xr-x 1 root staff    1013 Jun  7 22:27 libmysqlclient.la
lrwxrwxrwx 1 root staff      24 Jun  7 22:27 libmysqlclient.so -> libmysqlclient.so.16.0.0
lrwxrwxrwx 1 root staff      24 Jun  7 22:27 libmysqlclient.so.16 -> libmysqlclient.so.16.0.0
-rwxr-xr-x 1 root staff 1219344 Jun  7 22:27 libmysqlclient.so.16.0.0
-rw-r--r-- 1 root staff 1835708 Jun  7 22:27 libmysqlclient_r.a
-rwxr-xr-x 1 root staff    1067 Jun  7 22:27 libmysqlclient_r.la
lrwxrwxrwx 1 root staff      26 Jun  7 22:27 libmysqlclient_r.so -> libmysqlclient_r.so.16.0.0
lrwxrwxrwx 1 root staff      26 Jun  7 22:27 libmysqlclient_r.so.16 -> libmysqlclient_r.so.16.0.0
-rwxr-xr-x 1 root staff 1267368 Jun  7 22:27 libmysqlclient_r.so.16.0.0
-rw-r--r-- 1 root staff  781372 Jun  7 22:27 libmystrings.a
-rw-r--r-- 1 root staff 1380062 Jun  7 22:27 libmysys.a
-rw-r--r-- 1 root staff   35420 Jun  7 22:28 libvio.a
drwxr-sr-x 2 root staff    4096 Jun  7 22:28 plugin
--------------

What am I doing wrong? I run 'ldconfig' after installing MySQL from sources.

Thank you very much in advance.