Sorry, it turns out I can't test on my headless Ubuntu machine. It is
running Ubuntu 14.04 LTS which does not have a high enough version of
GTK3 to build the latest darkroom.

On 6 November 2016 at 09:00, Phil Rosenberg <[email protected]> wrote:
> Thanks Ulrich
> I just checked and the latest version of appstream available on Cygwin
> appears to be 0.2.8-1 and I have this version installed.
>
> I did a bit of grepping in the source directory and found the
> update_contact tag in data/darktable.appdata.xml.in. I changed this to
> <updatecontact> reran ./build.sh and the executable built fine. I have
> attached a patch. I'm currently installing the prerequisites on my
> headless Ubuntu system to see if I get the same build error on there
> and/or if the patch work or breaks the build.
>
> One other issue I had, was that when building rawspeed the flags -fPIC
> and -Werror are used. On Cygwin -fPIC is not needed as all code is
> position independent (I think - maybe it is just for dlls or
> something, but I'm not sure). This gives a warning saying that the
> -fPIC flag is ignored and not needed and because we are treating
> warnings as errors via -Werror the compilation fails. I have seen
> exactly this problem before with other libraries. It is relatively
> easy to fix with a handful of sed commands, but I wondered if there is
> a way to detect that we are using Cygwin and not include the -fPIC
> option? Perhaps in reality this is a CMake bug?
>
> Phil
>
> On 6 November 2016 at 08:01, Ulrich Pegelow <[email protected]> 
> wrote:
>> I also once experienced this error on my Linux box while compiling. To fix
>> it I needed to upgrade appstream-util. From version 0.2.6 to 0.4.1 in my
>> case.
>>
>> Ulrich
>>
>>
>> Am 06.11.2016 um 08:55 schrieb Phil Rosenberg:
>>>
>>> Hi
>>> Up front I will say I have read your policy on Windows and totally
>>> agree. I also work on an open source project and supporting many OSs
>>> is tough and usually requires at least a couple of developers willing
>>> to use and test the code as it develops.
>>>
>>> So with that in mind you are free to tell me that you cannot help me
>>> with building on Cygwin, however I'm very close to completing the
>>> build and I have made notes on how to get the build running which I am
>>> happy to share If that is useful to you.
>>>
>>> In case you can help, my issue is that during the make all step of the
>>> build I am getting this error
>>>
>>> Scanning dependencies of target darktable.appdata_file
>>> [ 99%] Generating darktable.appdata.xml
>>> Merging translations into
>>> /home/phil/usr/src/darktable/build/data/darktable.appdata.xml.
>>> CREATED /home/phil/usr/src/darktable/build/data/darktable.appdata.xml
>>> /home/phil/usr/src/darktable/build/data/darktable.appdata.xml: FAILED:
>>> • tag-missing           : <updatecontact> is not present
>>> Validation of files failed
>>> make[2]: *** [data/CMakeFiles/darktable.appdata_file.dir/build.make:89:
>>> data/darktable.appdata.xml] Error 1
>>> make[2]: *** Deleting file 'data/darktable.appdata.xml'
>>> make[1]: *** [CMakeFiles/Makefile2:6870:
>>> data/CMakeFiles/darktable.appdata_file.dir/all] Error 2
>>> make: *** [Makefile:139: all] Error 2
>>>
>>> I presume this is an xml tag that is missing from somewhere, but I
>>> can't work out which file it is missing from to look at fixing it. I'm
>>> not so good with makefiles.
>>>
>>> I'm building from the git repo if that helps. Currently at commit
>>> d62c69e36ab428e37df0ae6b57e704bc9178d0b0
>>>
>>> Thanks in advance
>>>
>>> Phil
>>>
>>> ___________________________________________________________________________
>>
>>
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