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How to install this camlib:

Copy the agfa-cl20 directory to ...../libgphoto2/camlibs

Then, edit the file configure.in (in the libgphoto2 directory) on lines:
148, and
160
to include "agfa-cl20" in the list of driver names.

THEN you can run "sh autoconf.sh"
./configure --prefix=/usr --with-drivers=agfa-cl20
make
make install