libsane-hpaio needs to link against -lsane

Not sure I understand the problem, but I applied your fix.

IMHO this is wrong. No libsane-<backend>.so.* library is linked against libsane!

sane tools like scanimage load backends dynamically (depending on backends listed in /etc/sane.d/dll.conf). Functions inside backends are called from their libsane based host (e.g. scanimage) but not vice versa.

My 3.9.6b works definitely (scanimage, xsane) without having this patch applied. ldd libsane-hpaio.so.1.0.0 lists:

        libhpip.so.0 => /usr/lib/libhpip.so.0 (0x40036000)
        libhpmud.so.0 => /usr/lib/libhpmud.so.0 (0x4005a000)
        libcups.so.2 => /usr/lib/libcups.so.2 (0x40139000)
        libdl.so.2 => /lib/libdl.so.2 (0x40216000)
        libc.so.6 => /lib/libc.so.6 (0x40219000)
        libm.so.6 => /lib/libm.so.6 (0x40338000)
        libusb-0.1.so.4 => /usr/lib/libusb-0.1.so.4 (0x4035b000)
        libpthread.so.0 => /lib/libpthread.so.0 (0x40363000)
        libnetsnmp.so.15 => /usr/lib/libnetsnmp.so.15 (0x40378000)
        libcrypt.so.1 => /lib/libcrypt.so.1 (0x4044d000)
        libz.so.1 => /lib/libz.so.1 (0x4047e000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)

Some hints:
- scanimage -L lists network based HP all-in-one scanners only with complete CUPS setup.

- very basic test:
   snmpwalk -Os -c public -v 1 <your hp hostname or ip> 1.3.6.1.4.1.11.2.3.9.1.1.7.0
   should give something like
   enterprises.11.2.3.9.1.1.7.0 = STRING: "MFG:HP;MDL:Photosmart C7200 series;CMD:MLC,PCL,PML,DW-PCL,DESKJET,DYN;1284.4DL[...]

- workaround:
* hp-probe -bnet
   should list your HP device.
* hp-makeuri <Hostname or IP>
   gives you three URIs. Grabe the one starting with "hpaio:", create file /etc/sane.d/dll.aliases, choose an alias for your device, e.g. myaio and put one line into that file
   myaio <hpaio-uri>
   replace <hpaui-uri> with URI from output of hp-makeuri
* then start xsane myaio and be happy.
* Drawback: scanning from inside OpenOffice or GIMP is not possible with this approach, because scanimage -L does not list your scanner! As mentioned above, to get this you need a complete CUPS setup.

I've just re-tested the original problem (OpenOffice.org crashing when attempting to scan) and it is already fixed without needing to link the SANE backend against libsane.

Sorry, I should have re-tested this before submitting the patch originally.

No problem, I removed the -lsane link from the tip.