[gentoo-user] Re: Brother scanner wants libusb-0.1.so.4

[Jonathan Callen]

On 10/05/2016 05:45 PM, Bertram Scharpf wrote:
> Hi,
>
> my olde Brother printer/scanner device MFC-7420 needs
> libraries that are provided as binaries on the Brother site.
> Until I switched to amd64 they worked well on a x64 system.
>
> Now I loaded down the amd64 version but it doesn't work. The
> problem seems to be a library load.
>
>   # SANE_DEBUG_DLL=1 scanimage -L
>   [sanei_debug] Setting debug level of dll to 1.
>   [dll] sane_init: SANE dll backend version 1.0.13 from sane-backends 1.0.24
>   [dll] load: dlopen() failed (libusb-0.1.so.4: cannot open shared object file: No such file or directory)
>   ...
>
>   No scanners were identified. ...
>
> Indeed, "libusb-0.1.so.4" is hardcoded in
> "libsane-brother2.so". The libraries present are
>
>   # equery b /lib64/libusb-*
>    * Searching for /lib64/libusb-1.0.so.0,/lib64/libusb-1.0.so.0.1.0 ...
>   dev-libs/libusb-1.0.19-r1 (/lib64/libusb-1.0.so.0.1.0)
>   dev-libs/libusb-1.0.19-r1 (/lib64/libusb-1.0.so.0 -> libusb-1.0.so.0.1.0)
>
> When I use brute force and symlink 0.1 to 1.0 I get another
> error that doesn't actually surprise me.
>
>   # ln -s libusb-1.0.so.0.1.0 libusb-0.1.so.4
>   # SANE_DEBUG_DLL=1 scanimage -L
>   [sanei_debug] Setting debug level of dll to 1.
>   [dll] sane_init: SANE dll backend version 1.0.13 from sane-backends 1.0.24
>   [dll] load: dlopen() failed (/usr/lib64/sane/libsane-brother2.so.1: undefined symbol: usb_busses)
>   ...
>
> Brother provides a source package but I cannot compile that
> because it isn't even complete, and when I mail them, they
> don't answer.
>
> Is there _any_ way to solve this?
>
> Thanks in advance.
>
> Bertram
>

To get libusb-0.1.so.4, you need to install dev-libs/libusb-compat
(which uses the new libusb 1.0 to provide the old libusb 0.1 API).

-- 
Jonathan Callen