[sane-devel] sane-backend 1.0.27 USB broken on Mac with Homebrew
paddy-hack at member.fsf.org
Thu Jul 27 12:01:19 UTC 2017
> Hi Olaf,
> sorry for the long wait, but now i'm back at the machine with the scanner.
No problem. I've been swamped with Real Work the last three days
> Am 24.07.17 um 14:09 schrieb Olaf Meeuwissen:
>> Try --with-usb=yes. That really *should* bomb.
> I put '--with-usb=yes' into the formula, but that didn't stop the
> compilation. You find the log here:
checking for USB... no
checking for USB... no
checking usb.h usability... yes
checking usb.h presence... yes
checking for usb.h... yes
checking for usb_interrupt_read in -lusb... yes
checking lusb0_usb.h usability... no
checking lusb0_usb.h presence... no
checking for lusb0_usb.h... no
So it *does* find some usable USB support and hence won't bomb. From
the comment in configure.ac, that first `yes` hints at a 10+ years old
libusb (or Windows version). I *think* it found something from that
>> From the config.log I see that there's probably a libusb-compat
>> installed somewhere. I'd suggest to get rid of that (as far as SANE is
>> concerned) because libusb-1.x should be okay.
>> From that same file, I also gather there should be libusb*.pc files (or
>> similar) in
>> Curious about what those have to say about libusb because, AFAIU, the
>> configure script should be looking at those before it decides there's
>> no USB support.
> i copied the contents of the two pc-files to this pad:
I have zero idea about homebrew works but the paths of the *.pc files
themselves and the prefixes they list look highly suspicious. That is,
the files live below /usr/local/opt/ but their prefix point below
/usr/local/Cellar/. There may be some symlinks to make this all work,
magically, but to me it looks fishy.
If those *.pc files are found when running ./configure, that excerpt of
the ./configure output quoted above should reduce to just
checking for USB... yes
and USB should work. The ./configure script makes sure that pkg-config
(which deals with these *.pc files) is set up correctly for your build
environment before it tries to find the *.pc files. From the initial
./configure output excerpt it very much looks like they are *not* found
> Then i force uninstalled libusb-compat.
> That stopped sane-find-scanner from working (See error-message at the
> end of the pad). So this looks more like sane-find-scanner is actually
> build with usb-support?
Yup. And if I am not mistaken, that came from libusb-compat which you
subsequently nuked. The error message is interesting though (in light
of those *.pc files you pasted).
dyld: Library not loaded: /usr/local/opt/libusb-compat/lib/libusb-0.1.4.dylib
The libusb.pc mentions a version of 0.1.5_1 (emulated_by=libusb-1.0 ??)
and libusb-1.0.pc mentions 1.0.21.
Hmm, libusb is 0.1.5? Seriously? The latest version is 0.1.12 and that
was released years ago. How does that jive with a 0.1.4.dylib?
# I'm not expecting you to answer this. I am just thinking "out loud".
> So i reinstalled (build-from-source) sane-backends (after deactivating
> the dependency for libusb-compat) and it bombed (of course).
> Logs from that: https://gist.github.com/dfbe878620c1ae20f1bcbda44dbe37e3
> So i reinstalled libusb-compat and now i'm back to where i started.
Based on the above, I would drop the 10+ year old duct tape that goes by
the name of libusb-compat and look at fixing whatever thwarts pkg-config
finding one of those *.pc files, preferably libusb-1.0.pc.
Having another round through the info in the various links you and Yurii
provided I noticed
checking for pkg-config... no
Is homebrew using pkgconfig instead? If so, I'd suggest adding
system "ln", "-s", "pkg-config", "/usr/bin/pkgconfig"
*before* running configure to sane-backends.rb. Adjust /usr/bin as
necessary. While at it, also drop the
or replace it with something like
at least, do yourself a favour and build against libusb-1.0.
So far for tonight's debugging session ;-) If you still have trouble,
don't hesitate to "bother" me (and the list ;-)
Hope this helps,
Olaf Meeuwissen, LPIC-2 FSF Associate Member since 2004-01-27
GnuPG key: F84A2DD9/B3C0 2F47 EA19 64F4 9F13 F43E B8A4 A88A F84A 2DD9
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