module imagick installation problems

hello i try , like descp in the manual, to install imagick PECL module (ext/imagick). configure php, with parameter --with-imagick, try too with --with-imagick=path but the module never is include in php (phpinfo) like other modules as gd etc... any ideas why? when i compile them manual in ext/imagick, then it works fine and i see a *.so file in module dir. thx bye richard