Hello, I have noticed that 'configure' defines HAVE_USBCALL with no trailing S, while sanei_usb.c expects HAVE_USBCALLS with a trailing S. So configure can't set up OS/2 correctly to use usbcalls since at least SANE 1.0.20. We have the choice to try to fix this, with the need of an OS/2 system to check if it works, or drop this code, as nobody complained for several years. Maybe we could just be lazy, and only change to HAVE_USBCALLS in 'configure' and wait for bug report, if any.
Regards, Stef