configure does not check for missing libjbig.so

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What steps will reproduce the problem?
1. have a system with missing libjbig.so
2. run configure
3. run make

What is the expected output? What do you see instead?
cwebp.exe (on cygwin) did not compile, error message was "ld: cannot find 
-ljbig " during make.

What version of the product are you using? On what operating system?
github cloned on july 10, 11am

Please provide any additional information below.
Installing libjbig fixed the problem. It is my understanding that configure 
should check for the existence of libjbig

Original issue reported on code.google.com by mathias.schindler on 10 Jul 2012 at 10:00

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Original comment by pascal.m...@gmail.com on 10 Jul 2012 at 4:43

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Can you attach your config.log for reference? I assume this has to do with an 
implicit dependency of libtiff(5?) as the binary does not directly reference 
the library.
A base cygwin without libpng/libjpeg/libtiff compiles, but I haven't yet tried 
to get a more complete version setup.

Original comment by jz...@google.com on 10 Jul 2012 at 10:07

• Changed state: Started

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This seems to come from libtiff.la; cygwin's libtiff5 requires libjbig2, but no 
dependency appears for libtiff-devel which contains a reference to libjbig in 
/usr/lib/libtiff.la.

I'm not sure how to test the link done by libtool rather than the more direct 
-ltiff currently being done in configure; there doesn't appear to be a 
pkg-config file included in the cygwin config.

The workaround is straightforward enough, install libjbig-devel. I'll leave 
this open, but lower the priority for now.

Original comment by jz...@google.com on 10 Jul 2012 at 11:50

• Changed state: Accepted
• Added labels: Priority-Low
• Removed labels: Priority-Medium

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Here is the config.log file from the successul compilation after installation 
of libjbig-devel from yesterday morning.

Original comment by mathias.schindler on 11 Jul 2012 at 6:43

Attachments:

• config.log

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So based on the comment from jz, is this something that cygwin should fix 
rather than webp's configuration file?

Original comment by mathias.schindler on 11 Jul 2012 at 6:58

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> So based on the comment from jz, is this something that cygwin should fix 
rather than webp's configuration file?

Yes, I believe the main problem is with the cygwin package. If it's possible to 
emulate the libtool link in the test then the configure could be made more 
robust.
I didn't see any reports on the cygwin mailing lists about this. If I get a 
chance I can try to prepare a bug report for cygwin-apps.

Below I added the test which succeeds from the configure test:

configure:11753: checking for TIFFGetVersion in -ltiff
configure:11778: gcc -o conftest.exe -g -O2    conftest.c -ltiff    >&5
configure:11778: $? = 0
configure:11787: result: yes

Original comment by jz...@google.com on 11 Jul 2012 at 5:59

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I reported this to cygwin-apps [1].

[1] http://cygwin.com/ml/cygwin-apps/2012-08/msg00081.html

Original comment by jz...@google.com on 22 Aug 2012 at 2:21

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I can confirm that this is indeed a Cygwin packaging issue.

Original comment by yselkow...@gmail.com on 22 Aug 2012 at 2:56

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This has been fixed on the Cygwin side.

Original comment by jz...@google.com on 23 Aug 2012 at 12:26

• Changed state: Done

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Thank you.

Original comment by mathias.schindler on 23 Aug 2012 at 7:01