Problem installing Turck MMCache

[GeneralSquall]

Hi,
I have problem with Turck MMCache installation on RedHat EL3 with Plesk 7.5.4. I've search my HDD and found phpize in /usr/local/psa/admin/bin/ only. So I supposed that root installation of PHP is /usr/local/psa/admin, but I've got an error:

/usr/bin/phpize: line 48: cd: /usr/local/psa/admin/lib/php/build: No such file or directory
/usr/bin/phpize: line 49: cd: /usr/local/psa/admin/lib/php/build: No such file or directory
/usr/bin/phpize: line 52: /usr/local/psa/admin/lib/php/build/phpize.m4: No such file or directory
aclocal: `configure.ac' or `configure.in' is required


Then I searched this forum and found an explanation, that root directory for php is "/usr", but there is no such file /usr/bin/phpize! :-( And even if I do cp /usr/local/psa/admin/bin/phpize /usr I still get the same error (see above).

Can anyone help me with an advice? May be I am missing something?..