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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
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