[sane-devel] Get the devices about sane

[YiHao at rst.ricoh.com]

Dear allan:

I am sorry to trouble you again,
I can use the sane backend by following methods,
SANE_DEBUG_RICOH=255  scanimage --format=tiff  >out1.tiff

but if no environment variables "SANE_DEBUG_RICOH=255",
sane will not be able to work => scanimage: no SANE devices found.
Excuse me,  Is this what I need to do?

Look forward to your help, Thank you~
Best Regard
Yours Sincerely, Yihao