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

Hi. Trying to install PHP 5.2.17 (with MySQL 5.1.55) on a Linux box: --------- # ./configure --prefix=/usr/local/php --with-apxs2=/usr/local/apache2/bin/apxs --with-mysql=/usr/local/mysql ----------- I get this error within my 'debug.log' file: --------------- 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: ---------- # 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.