2.5 from source install problem with extensions

[Florian Demmer]

Hi!

I am doing a from source installation of Python 2.5 on some old Debian
machine. As the target directoy I want /opt/somename so i added it to
the configure like so:

./configure --prefix=/opt/somedir

The following make works fine as far as I can see. Then the make
install also actually works and installs python in /opt/somedir with
all its subdirectoris (bin, lib, man, include).
The extensions (*.so) however get put in /usr/local/lib/... and there
also in the wrong python directoy: 2.4

This is a c/p of the make install output:
[...]
running build_scripts
running install_lib
changing mode of /usr/local/lib/python2.4/site-packages/_struct.so to
755
changing mode of /usr/local/lib/python2.4/site-packages/_ctypes.so to
755
[...]

(How) can I change the install_dir for the extensions?
Why does it use python2.4 anyway?! What env var or else is set here
that I cannot find?

thanks!