Description:
------------
Compiled Apache, PHP and PDO_IFORMIX (see Test script). 
But PDO-Driver isn't recognized 
Tried with PHP 7.0.32 AND 7.2.6 and pdo_informix 1.3.2 and 1.3.3
Apache Version 2.4.33


Test script:
---------------
Compiled Apache
CFLAGS="-m64" CXXFLAGS="m64" ./configure --prefix=/etc/apache2.4 --with-included-apr --enable-so --enable-env --enable-deflate --enable-ssl --enable-cache --enable-auth-basic-module --enable-dir --enable-expires --enable-include --enable-mime --enable-rewrite --enable-setenvif --enable-http --enable-file-cache --enable-echo --enable-disk-cache --enable-memcache --enable-headers --enable-vhost-alias --enable-dav --enable-dav-fs --enable-davlock
CFLAGS="-m64" CXXFLAGS="-m64" make clean
CFLAGS="-m64" CXXFLAGS="-m64" make
CFLAGS="-m64" CXXFLAGS="-m64" make install

Compiled PHP 7.0.32 AND 7.2.6
  CFLAGS="-m64" CXXFLAGS="-m64" ./configure --with-apxs2=/etc/apache2.4/bin/apxs --prefix=/etc/apache2.4/php --with-config-file-path=/etc/apache2.4 --with-mcrypt  --enable-calendar --enable-ctype --enable-dom --enable-filter --enable-hash --with-openssl --enable-json --enable-libxml=/usr/lib --enable-mbstring --with-mhash --enable-pdo --enable-session --enable-soap --enable-simplexml --enable-tokenizer --enable-xml --enable-xmlreader --enable-xmlwriter --enable-zip --with-curl
  CFLAGS="-m64" CXXFLAGS="-m64" make clean
  CFLAGS="-m64" CXXFLAGS="-m64" make
  CFLAGS="-m64" CXXFLAGS="-m64" make install

Compiled PDO_INFORMIX (1.3.2 AND 1.3.3)
  CFLAGS="-m64" CXXFLAGS="-m64" /etc/apache2.4/php/bin/phpize
  CFLAGS="-m64" CXXFLAGS="-m64" ./configure --with-pdo-informix=/opt/IBM/informix --with-php-config=/etc/apache2.4/php/bin/php-config
  CFLAGS="-m64" CXXFLAGS="-m64" make clean
  CFLAGS="-m64" CXXFLAGS="-m64" make
  CFLAGS="-m64" CXXFLAGS="-m64" make install

Edit php.ini and copied the pdo_informix.so to php extension_dir and restart apache.
Check for PDO-Driver in phpinfo(). 

Expected result:
----------------
Section "PDO drivers" in phpinfo() should show "sqlite,informix" 

Actual result:
--------------
Section "PDO drivers" in phpinfo() only shows "sqlite"