Hello,
I am using Fedora 20 with ccache-3.1.9 and gcc-4.8.3.
DT build fails with following errors.

[ 31%] /media/M-Drive/Software/Source/darktable/src/common/darktable.c:
In function ‘dt_init’:
/media/M-Drive/Software/Source/darktable/src/common/darktable.c:462:9:
error: variable ‘lua_command’ set but not used
[-Werror=unused-but-set-variable]
   char *lua_command  __attribute__((unused))= NULL;
         ^
cc1: all warnings being treated as errors
make[2]: *** [src/CMakeFiles/lib_darktable.dir/common/darktable.c.o]
Error 1
make[2]: *** Waiting for unfinished jobs....
Building CXX object src/CMakeFiles/lib_darktable.dir/common/exif.cc.o
In file included from /usr/include/exiv2/metadatum.hpp:39:0,
                 from /usr/include/exiv2/exif.hpp:34,
                 from /usr/include/exiv2/easyaccess.hpp:33,

from /media/M-Drive/Software/Source/darktable/src/common/exif.cc:40:
/usr/include/exiv2/value.hpp:984:56: note: attribute for ‘struct
Exiv2::DateValue::Date’ must follow the ‘struct’ keyword
         EXIV2API struct Date
                                                        ^
make[1]: *** [src/CMakeFiles/lib_darktable.dir/all] Error 2
make: *** [all] Error 2
[kasun@localhost darktable]$ 



Here I attached complete output. Is there way to built it?

-- 
Best Regards,
Kasun Chathuranga
http://kasunc.blogspot.com


"What you are is
what you have been.
What you'll be is
what you do now."
[kasun@localhost Source]$ git clone 
https://github.com/darktable-org/darktable.git
Cloning into 'darktable'...
remote: Reusing existing pack: 99709, done.
remote: Total 99709 (delta 0), reused 0 (delta 0)
Receiving objects: 100% (99709/99709), 128.88 MiB | 387.00 KiB/s, done.
Resolving deltas: 100% (77862/77862), done.
Checking connectivity... done.
[kasun@localhost Source]$ cd darktable/
[kasun@localhost darktable]$ ./build.sh --prefix 
/home/kasun/Apps/Image-Processing/darktable --buildtype Release
Darktable build script

Building directory:  ./build
Installation prefix: /home/kasun/Apps/Image-Processing/darktable
Build type:          Release
Make program:        make
Make tasks:          4


-- The CXX compiler identification is GNU 4.8.3
-- The C compiler identification is GNU 4.8.3
-- Check for working CXX compiler: /usr/lib64/ccache/c++
-- Check for working CXX compiler: /usr/lib64/ccache/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working C compiler: /usr/lib64/ccache/cc
-- Check for working C compiler: /usr/lib64/ccache/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Determining version
-- Looking for external programs
-- Found perl
-- Found intltool-merge
-- Found xsltproc
-- Found xmllint
-- All external programs found
-- Found Gettext 
-- Found msgfmt to convert language file. Translation enabled
-- Try OpenMP C flag = [-fopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Success
-- Try OpenMP CXX flag = [-fopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Success
-- Found OpenMP: -fopenmp  
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.28") 
-- checking for module 'glib-2.0'
--   found glib-2.0, version 2.38.2
-- Found Glib 
-- Found GTK2_GTK: /usr/lib64/libgtk-x11-2.0.so  
-- Found LibXml2: /usr/lib64/libxml2.so (found suitable version "2.9.1", 
minimum required is "2.6") 
-- Found GPHOTO2: /usr/lib64/libgphoto2.so  
-- Found INOTIFY: /usr/include  
-- Found OPENEXR: 
/usr/lib64/libIlmImf.so;/usr/lib64/libImath.so;/usr/lib64/libIex.so;/usr/lib64/libIlmThread.so
  
-- checking for module 'libwebp'
--   found libwebp, version 0.3.1
-- Found WEBP: /usr/lib64/libwebp.so (Required is at least version "0.3.0") 
-- Found LENSFUN: /usr/lib64/liblensfun.so  
-- checking for module 'gio-2.0'
--   found gio-2.0, version 2.38.2
-- Found GIO 
-- Found GThread: /usr/lib64/libgthread-2.0.so  
-- Found GModule: /usr/lib64/libgmodule-2.0.so  
-- checking for module 'cairo'
--   found cairo, version 1.13.1
-- Found Cairo 
-- Found PANGOCAIRO: /usr/lib64/libpangocairo-1.0.so  
-- Found PThread: /usr/lib64/libpthread.so  
-- Found RSVG2: /usr/lib64/librsvg-2.so  
-- checking for module 'gdk-pixbuf-2.0'
--   found gdk-pixbuf-2.0, version 2.30.3
-- Found GDK-PixBuf 
-- Found LibXml2: /usr/lib64/libxml2.so (found version "2.9.1") 
-- Found SQLITE3: /usr/lib64/libsqlite3.so  
-- Found EXIV2: /usr/lib64/libexiv2.so  
-- Found CURL: /usr/lib64/libcurl.so (found version "7.32.0") 
-- Found ZLIB: /usr/lib64/libz.so (found version "1.2.8") 
-- Found PNG: /usr/lib64/libpng.so (found version "1.6.6") 
-- Found JPEG: /usr/lib64/libjpeg.so  
-- Found TIFF: /usr/lib64/libtiff.so (found version "4.0.3") 
-- Found LCMS2: /usr/lib64/liblcms2.so  
-- Internationalization: Enabled
-- Found FLICKCURL: /usr/lib64/libflickcurl.so  
-- checking for module 'json-glib-1.0'
--   package 'json-glib-1.0' not found
-- checking for module 'libopenjpeg1'
--   found libopenjpeg1, version 1.5.1
-- Found OpenJPEG: /usr/lib64/libopenjpeg.so  
-- Found GNOMEKEYRING: /usr/lib64/libgnome-keyring.so  
-- checking for module 'GraphicsMagick'
--   found GraphicsMagick, version 1.3.19
-- Found GraphicsMagick 
-- Checking for -march=native support
-- Performing Test MARCHNATIVE
-- Performing Test MARCHNATIVE - Success
-- checking for one of the modules 'lua5.2;lua-5.2;lua'
-- Lua support: System library not found (to use darktable's version use 
-DDONT_USE_INTERNAL_LUA=Off)
-- checking for one of the modules 'libsoup-2.4;libsoup2'
-- checking for one of the modules 'libsoup-2.2;libsoup2'
-- Map mode: enabled
-- checking for module 'colord'
--   found colord, version 1.1.7
-- Looking for include file pthread.h
-- Looking for include file pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - found
-- Found Threads: TRUE  
-- Found SDL: /usr/lib64/libSDL.so (found version "1.2.15") 
-- Looking for XOpenDisplay in /usr/lib64/libX11.so;/usr/lib64/libXext.so
-- Looking for XOpenDisplay in /usr/lib64/libX11.so;/usr/lib64/libXext.so - 
found
-- Looking for gethostbyname
-- Looking for gethostbyname - found
-- Looking for connect
-- Looking for connect - found
-- Looking for remove
-- Looking for remove - found
-- Looking for shmat
-- Looking for shmat - found
-- Found X11: /usr/lib64/libX11.so
-- Found OpenGL: /usr/lib64/libGL.so  
-- 
-- Could NOT find Java (missing:  Java_JAVAH_EXECUTABLE) (found version "1.8.0")
-- No saxon XSLT processor and/or no docbook saxon extension library found.
Xslt processor saxon not found. HTML usermanual will be built with xsltproc;
expect usermanual with inconsistent screenshot and image dimensions.
Missing xml2po. No localized usermanuals are build
Missing xml2po
Can NOT update usermanual
-- Configuring done
-- Generating done
-- Build files have been written to: 
/media/M-Drive/Software/Source/darktable/build
Scanning dependencies of target locale_cs
Scanning dependencies of target locale_da
Scanning dependencies of target locale_ca
Scanning dependencies of target locale_de
[  0%] [  0%] [  0%] [  0%] Building cs locale
Building ca locale
Building de locale
Building da locale
353 translated messages, 391 fuzzy translations, 1059 untranslated messages.
[  0%] 1783 translated messages.
Built target locale_ca
1797 translated messages.
[  0%] [  0%] Built target locale_de
Built target locale_da
1796 translated messages.
Scanning dependencies of target locale_el
Scanning dependencies of target locale_fi
Scanning dependencies of target locale_es
[  0%] [  0%] Built target locale_cs
[  0%] [  1%] Building el locale
Building es locale
Building fi locale
Scanning dependencies of target locale_fr
[  1%] Building fr locale
613 translated messages, 551 fuzzy translations, 454 untranslated messages.
1778 translated messages.
1774 translated messages.
[  1%] [  1%] [  1%] Built target locale_fi
Built target locale_el
Built target locale_es
1805 translated messages.
[  1%] Built target locale_fr
Scanning dependencies of target locale_gl
Scanning dependencies of target locale_ja
Scanning dependencies of target locale_it
Scanning dependencies of target locale_nl
[  1%] [  1%] [  1%] Building ja locale
Building it locale
Building gl locale
[  3%] Building nl locale
398 translated messages, 591 fuzzy translations, 629 untranslated messages.
[  3%] 1744 translated messages.
Built target locale_gl
[  3%] Built target locale_ja
1805 translated messages.
Scanning dependencies of target locale_pl
[  3%] Scanning dependencies of target locale_pt_BR
[  3%] Built target locale_it
1805 translated messages.
[  3%] Building pl locale
[  3%] Building pt_BR locale
Scanning dependencies of target locale_pt_PT
Built target locale_nl
Scanning dependencies of target locale_ro
[  3%] [  3%] Building pt_PT locale
Building ro locale
1706 translated messages.
[  3%] Built target locale_pt_BR
1744 translated messages.
[  3%] Built target locale_pl
Scanning dependencies of target locale_ru
[  3%] 1739 translated messages, 1 fuzzy translation, 4 untranslated messages.
Building ru locale
Scanning dependencies of target locale_sq
[  3%] Built target locale_pt_PT
713 translated messages, 490 fuzzy translations, 415 untranslated messages.
[  3%] [  3%] Scanning dependencies of target locale_sv
Built target locale_ro
Building sq locale
[  4%] Scanning dependencies of target locale_th
Building sv locale
[  4%] Building th locale
1576 translated messages, 57 fuzzy translations, 111 untranslated messages.
1736 translated messages, 3 fuzzy translations, 5 untranslated messages.
[  4%] [  4%] Built target locale_ru
Built target locale_sq
Scanning dependencies of target locale_zh_CN
Scanning dependencies of target locale_uk
[  4%] [  4%] Building uk locale
Building zh_CN locale
530 translated messages, 2 fuzzy translations, 1098 untranslated messages.
1798 translated messages, 3 untranslated messages.
[  4%] Built target locale_th
[  4%] Built target locale_sv
Scanning dependencies of target osmgpsmap
Scanning dependencies of target rawspeed
1518 translated messages, 74 fuzzy translations, 26 untranslated messages.
[  4%] 1732 translated messages, 4 fuzzy translations, 8 untranslated messages.
Built target locale_zh_CN
[  4%] Built target locale_uk
Scanning dependencies of target libraw_r
Scanning dependencies of target colord-gtk
[  4%] Building CXX object 
src/external/LibRaw/CMakeFiles/libraw_r.dir/internal/dcraw_common.cpp.o
[  4%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/HasselbladDecompressor.cpp.o
[  4%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/IOException.cpp.o
[  4%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/DngOpcodes.cpp.o
[  4%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/SrwDecoder.cpp.o
[  4%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/TiffParserOlympus.cpp.o
[  6%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/RawImageDataFloat.cpp.o
[  6%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/X3fDecoder.cpp.o
[  6%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/CameraSensorInfo.cpp.o
[  6%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/StdAfx.cpp.o
[  8%] Building C object 
src/external/colord-gtk/CMakeFiles/colord-gtk.dir/src/colord-gtk/cd-window.c.o
[  8%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/BitPumpMSB32.cpp.o
[  8%] Building C object 
src/external/osm-gps-map/CMakeFiles/osmgpsmap.dir/src/converter.c.o
[  8%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/ErfDecoder.cpp.o
[  9%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/LJpegPlain.cpp.o
[  9%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/TiffIFDBE.cpp.o
[  9%] Building C object 
src/external/osm-gps-map/CMakeFiles/osmgpsmap.dir/src/osd-utils.c.o
[  9%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/BitPumpMSB.cpp.o
[  9%] [  9%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/ByteStream.cpp.o
Building C object 
src/external/osm-gps-map/CMakeFiles/osmgpsmap.dir/src/osm-gps-map-compat.c.o
[  9%] Building C object 
src/external/osm-gps-map/CMakeFiles/osmgpsmap.dir/src/osm-gps-map-image.c.o
[  9%] Building C object 
src/external/osm-gps-map/CMakeFiles/osmgpsmap.dir/src/osm-gps-map-layer.c.o
[  9%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/Cr2Decoder.cpp.o
[  9%] Building C object 
src/external/osm-gps-map/CMakeFiles/osmgpsmap.dir/src/osm-gps-map-osd.c.o
[  9%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/NefDecoder.cpp.o
[  9%] Building C object 
src/external/colord-gtk/CMakeFiles/colord-gtk.dir/src/colord-gtk/cd-window-sync.c.o
[ 11%] [ 13%] Building C object 
src/external/osm-gps-map/CMakeFiles/osmgpsmap.dir/src/osm-gps-map-point.c.o
Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/LJpegDecompressor.cpp.o
[ 13%] Building C object 
src/external/osm-gps-map/CMakeFiles/osmgpsmap.dir/src/osm-gps-map-source.c.o
Linking C static library libcolord-gtk.a
[ 13%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/pugixml.cpp.o
[ 13%] Building C object 
src/external/osm-gps-map/CMakeFiles/osmgpsmap.dir/src/osm-gps-map-track.c.o
[ 13%] Building C object 
src/external/osm-gps-map/CMakeFiles/osmgpsmap.dir/src/osm-gps-map-widget.c.o
[ 13%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/Common.cpp.o
[ 13%] Built target colord-gtk
[ 13%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/DngDecoderSlices.cpp.o
[ 14%] Building CXX object 
src/external/LibRaw/CMakeFiles/libraw_r.dir/src/libraw_cxx.cpp.o
[ 14%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/OrfDecoder.cpp.o
[ 14%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/FileIOException.cpp.o
[ 14%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/TiffParserHeaderless.cpp.o
[ 14%] Building CXX object 
src/external/LibRaw/CMakeFiles/libraw_r.dir/internal/dcraw_fileio.cpp.o
[ 14%] Building CXX object 
src/external/LibRaw/CMakeFiles/libraw_r.dir/internal/demosaic_packs.cpp.o
Linking C static library libosmgpsmap.a
[ 16%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/TiffParser.cpp.o
[ 16%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/TiffParserException.cpp.o
[ 16%] Building CXX object 
src/external/LibRaw/CMakeFiles/libraw_r.dir/src/libraw_c_api.cpp.o
[ 16%] Built target osmgpsmap
[ 16%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/CameraMetaData.cpp.o
Scanning dependencies of target squish
[ 16%] [ 16%] [ 16%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/X3fParser.cpp.o
Building CXX object 
src/external/LibRaw/CMakeFiles/libraw_r.dir/src/libraw_datastream.cpp.o
Building CXX object src/external/squish/CMakeFiles/squish.dir/alpha.cpp.o
[ 16%] Building CXX object 
src/external/squish/CMakeFiles/squish.dir/clusterfit.cpp.o
[ 16%] Building CXX object 
src/external/squish/CMakeFiles/squish.dir/colourblock.cpp.o
[ 16%] [ 16%] Building CXX object 
src/external/squish/CMakeFiles/squish.dir/colourfit.cpp.o
Generating metadata_gen.h, metadata_gen.c
[ 16%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/RawParser.cpp.o
Scanning dependencies of target metadata_dummy
[ 16%] Building CXX object 
src/external/squish/CMakeFiles/squish.dir/colourset.cpp.o
[ 16%] Building C object src/CMakeFiles/metadata_dummy.dir/metadata_gen.c.o
[ 18%] Building CXX object src/external/squish/CMakeFiles/squish.dir/maths.cpp.o
[ 18%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/RawDecoder.cpp.o
Linking C static library libmetadata_dummy.a
[ 18%] Building CXX object 
src/external/squish/CMakeFiles/squish.dir/rangefit.cpp.o
[ 18%] [ 19%] [ 19%] Built target metadata_dummy
Building CXX object 
src/external/squish/CMakeFiles/squish.dir/singlecolourfit.cpp.o
Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/NikonDecompressor.cpp.o
[ 19%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/CameraMetadataException.cpp.o
[ 19%] [ 19%] Building CXX object 
src/external/squish/CMakeFiles/squish.dir/squish.cpp.o
Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/FileWriter.cpp.o
[ 19%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/FileMap.cpp.o
Linking CXX static library libsquish.a
[ 19%] [ 19%] Built target squish
Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/TiffEntry.cpp.o
[ 19%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/RawImage.cpp.o
Scanning dependencies of target darktable.desktop
[ 19%] [ 21%] [ 21%] Generating darktable.desktop
Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/ByteStreamSwap.cpp.o
Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/DcrDecoder.cpp.o
Scanning dependencies of target darktablerc
[ 22%] Generating darktablerc
[ 22%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/ThreefrDecoder.cpp.o
[ 22%] Built target darktablerc
[ 22%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/PefDecoder.cpp.o
Scanning dependencies of target darktablerc.html
[ 22%] Generating darktablerc.html
[ 22%] Built target darktablerc.html
[ 22%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/BitPumpPlain.cpp.o
Scanning dependencies of target manpages
[ 22%] Generating darktable.1
[ 22%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/RawDecoderException.cpp.o
[ 22%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/RafDecoder.cpp.o
[ 24%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/TiffIFD.cpp.o
[ 24%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/MefDecoder.cpp.o
[ 24%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/FileReader.cpp.o
[ 24%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/Camera.cpp.o
[ 24%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/TiffEntryBE.cpp.o
[ 24%] Generating darktable-cli.1
[ 24%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/DngDecoder.cpp.o
[ 24%] Built target manpages
[ 26%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/MosDecoder.cpp.o
[ 26%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/MrwDecoder.cpp.o
[ 26%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/ColorFilterArray.cpp.o
[ 26%] [ 26%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/Rw2Decoder.cpp.o
Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/BlackArea.cpp.o
[ 26%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/ArwDecoder.cpp.o
[ 27%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/RawImageDataU16.cpp.o
[ 27%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/KdcDecoder.cpp.o
[ 27%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/BitPumpJPEG.cpp.o
[ 27%] Building CXX object 
src/external/rawspeed/CMakeFiles/rawspeed.dir/RawSpeed/PentaxDecompressor.cpp.o
Linking CXX static library librawspeed.a
Merging translations into 
/media/M-Drive/Software/Source/darktable/build/data/darktable.desktop.
[ 27%] Built target darktable.desktop
[ 27%] Built target rawspeed
Linking CXX static library liblibraw_r.a
[ 27%] Built target libraw_r
[ 27%] Generating preferences_gen.h
Scanning dependencies of target lib_darktable
[ 27%] Building C object src/CMakeFiles/lib_darktable.dir/metadata_gen.c.o
[ 27%] [ 27%] [ 29%] Building C object 
src/CMakeFiles/lib_darktable.dir/bauhaus/bauhaus.c.o
Building C object src/CMakeFiles/lib_darktable.dir/common/cache.c.o
Building C object src/CMakeFiles/lib_darktable.dir/common/calculator.c.o
[ 29%] Building C object src/CMakeFiles/lib_darktable.dir/common/collection.c.o
[ 29%] Building C object src/CMakeFiles/lib_darktable.dir/common/colorlabels.c.o
[ 29%] Building C object src/CMakeFiles/lib_darktable.dir/common/colorspaces.c.o
[ 29%] Building C object src/CMakeFiles/lib_darktable.dir/common/curve_tools.c.o
[ 29%] Building C object src/CMakeFiles/lib_darktable.dir/common/darktable.c.o
[ 29%] Building C object src/CMakeFiles/lib_darktable.dir/common/database.c.o
[ 31%] Building C object src/CMakeFiles/lib_darktable.dir/common/dbus.c.o
[ 31%] /media/M-Drive/Software/Source/darktable/src/common/darktable.c: In 
function ‘dt_init’:
/media/M-Drive/Software/Source/darktable/src/common/darktable.c:462:9: error: 
variable ‘lua_command’ set but not used [-Werror=unused-but-set-variable]
   char *lua_command  __attribute__((unused))= NULL;
         ^
cc1: all warnings being treated as errors
make[2]: *** [src/CMakeFiles/lib_darktable.dir/common/darktable.c.o] Error 1
make[2]: *** Waiting for unfinished jobs....
Building CXX object src/CMakeFiles/lib_darktable.dir/common/exif.cc.o
In file included from /usr/include/exiv2/metadatum.hpp:39:0,
                 from /usr/include/exiv2/exif.hpp:34,
                 from /usr/include/exiv2/easyaccess.hpp:33,
                 from 
/media/M-Drive/Software/Source/darktable/src/common/exif.cc:40:
/usr/include/exiv2/value.hpp:984:56: note: attribute for ‘struct 
Exiv2::DateValue::Date’ must follow the ‘struct’ keyword
         EXIV2API struct Date
                                                        ^
make[1]: *** [src/CMakeFiles/lib_darktable.dir/all] Error 2
make: *** [all] Error 2
[kasun@localhost darktable]$ 

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