root@brezhnev:/usr/src/php-5.2.6# pecl install pdo
WARNING: channel "pecl.php.net" has updated its protocols, use "channel-update pecl.php.net" to update
downloading PDO-1.0.3.tgz ...
Starting to download PDO-1.0.3.tgz (52,613 bytes)
.............done: 52,613 bytes
12 source files, building
running: phpize
Configuring for:
PHP Api Version: 20041225
Zend Module Api No: 20060613
Zend Extension Api No: 220060519
Cannot find autoconf. Please check your autoconf installation and the $PHP_AUTOCONF environment variable is set correctly and then rerun this script.
I won't assume any particular distro here - instead here's where you can go to get the autoconf and m4 sources. Follow these steps to download and install them. Your extension installations should work just fine thereafter:
# cd /usr/src
# wget http://ftp.gnu.org/gnu/m4/m4-1.4.9.tar.gz
# tar -zvxf m4-1.4.9.tar.gz
# cd m4-1.4.9/
# ./configure && make && make install
# cd ../
# wget http://ftp.gnu.org/gnu/autoconf/autoconf-2.62.tar.gz
# tar -zvxf autoconf-2.62.tar.gz
# cd autoconf-2.62/
# ./configure && make && make install
christo