SANE does not allow c++ external backend ( epkowa for epson V200)

Question

Some Epson scanners ( Perfection V100, V200, etcc )  need  an external library  and the corresponding firmware from epson site  ( package iscan  and iscan-plugin ).
On gentoo, debian based  and rpm based  distrib, sane is compiled to allow such things
Stock sane from  sane.org and  arch  does not seem  to link with the c++ backend  epkowa  provided  by  epson
xsane work fine  but   scanimage -L  not ( scanimage is necessary for scripting ) 
To use an epson  external firmware based scanner , one  have to  compile  sane  by hand
and modify  frontend/Makefile   
LINK = $(CC)  [...]    need to be replaced  by  LINK = g++  [ ... ] 
Lost several hours to figure out where was the prb,  cause the epkowa  sane backend used to work  out of the box on other distrib

Answer 1

I "SOLVED"
I replaced the original "epson", "epson2" and "epkowa" drivers with the drivers installed on a notebook with Fedora16 (and sane 1.0.23), and now epkowa profile works good with all resolutions!
You can download Fedora16 epson drivers here.
$ ls -l /usr/lib/sane|grep epson
-rwxr-xr-x 1 pippo pippo 179760 10 set 2012 libsane-epson2.so
-rwxr-xr-x 1 pippo pippo 179760 10 set 2012 libsane-epson2.so.1
-rwxr-xr-x 1 pippo pippo 179760 10 set 2012 libsane-epson2.so.1.0.23
-rwxr-xr-x 1 pippo pippo 122080 10 set 2012 libsane-epson.so
-rwxr-xr-x 1 pippo pippo 122080 10 set 2012 libsane-epson.so.1
-rwxr-xr-x 1 pippo pippo 122080 10 set 2012 libsane-epson.so.1.0.23
$ ls -l /usr/lib/sane|grep epkowa
-rwxr-xr-x 1 pippo pippo 889 9 dic 11.12 libsane-epkowa.la
lrwxrwxrwx 1 root root 24 1 giu 18.34 libsane-epkowa.so -> libsane-epkowa.so.1.0.15
-rwxr-xr-x 1 pippo pippo 620651 9 dic 11.12 libsane-epkowa.so.1
-rwxr-xr-x 1 pippo pippo 620651 9 dic 11.12 libsane-epkowa.so.1.0.15
Last edited by quellen (2014-06-05 11:57:25)