php_pdo.h is missing too, so make fails.

Thank you for taking the time to write to us, but this is not
a bug.

PDO support must be built into php itself.

Sounds like a bug to me.

I know that there is PDO-support in PHP itself. But as far as I understood the PECL-Packages should work with future versions of PHP too, so you can install PDO-updates from PECL, even if there is no new release of php-core.

That's what future Gentoo-Linux Packages for PHP will rely on: http://stu.gnqs.org/diary/gentoo.php/2005/07/31/php_overlay_updated

When installing PHP you can choose PDO from php-core ("pdo" USE-Flag) or PDO packages from PECL ("pdo-external" USE-Flag), which can be updated separately later. If this should not be done for future PHP versions, please let me know!

The problem described in this bug report happens if I try to install such PECL-Packages (Drivers) for PDO, when PHP was compiled with "--without-pdo", which leads to the missing header-files in ext/pdo. And when I install PECL-pdo it does not copy/install these header-files (needed by PECL PDO-drivers later) from its source directory to php's ext/pdo directory.

Sounds like a gentoo bug ;-)
I can't repeat this if you use the PHP supported approach:

pear install pdo
pear install pdo_XXX

Wez, have you ensured that your $PHP_INCLUE_DIR/ext/pdo directory used by pear/php-config is empty (from old install, or --with-pdo...)? 

I noticed the problem while testing the PECL packages for Gentoo. 

I build PHP and PDO completely (manually) from source in my home directory, and I'm not the only one having this problem.

That's what I did:

export PHP_PREFIX="/home/akorthaus/bin/php-5.1.0RC1"
rm -r $PHP_PREFIX
cd ~/src

rm -r php-5.1.0RC1
tar -xjf php-5.1.0RC1.tar.bz2
cd php-5.1.0RC1
./configure --prefix=$PHP_PREFIX --disable-all
make && make install && make install-cli
cd ..

tar -xzf PDO-1.0RC1.tgz
cd PDO-1.0RC1
$PHP_PREFIX/bin/phpize
./configure --with-php-config=$PHP_PREFIX/bin/php-config
make && make install
cd ..

tar -xzf PDO_sqlite-1.0RC1.tgz
cd PDO_SQLITE-1.0RC1
$PHP_PREFIX/bin/phpize
./configure --with-php-config=$PHP_PREFIX/bin/php-config

And HERE I get an error:

checking for PDO includes... checking for PDO includes...
configure: error: Cannot find php_pdo_driver.h.


If I check this:

$ ls $PHP_PREFIX/include/php/ext
date  standard

There is no PDO directory. For the Gentoo ebuild we have to create that directory, and copy the 3 header-files created in PDO src directory here.

I also canot find a line in http://cvs.php.net/co.php/pecl/pdo/config.m4 - where this should be done from PECL-PDO package itself.

PHP - if configured --without-pdo - does not ship with the needed header PDO Header files, so where should PECL-PDO-SQLITE... get them from?

probably PHP_INSTALL_HEADERS is not defined?
But why?

config.m4:

  ifdef([PHP_INSTALL_HEADERS],
  [
    PHP_INSTALL_HEADERS(ext/pdo, [php_pdo.h php_pdo_driver.h])
  ], [
    PHP_ADD_MAKEFILE_FRAGMENT
  ])

Makefile.frag defines install-pdo-headers target and a hack that should cause it to run alongside the install.
I'll see if there's a better way.

Fixed on 5.1 branch.
Will push a PECL release either today or tomorrow.

Your fix works for me, thanks a lot wez!