Visual Studio2017 for Mac 7.5;

 Xcode 9.31;

 Wikitude sdk(ios-unified) 7.2.1;

> clang : error : linker command failed with exit code 1 (use -v to see invocation)
>    
>    MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LDspInit¡¯.
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
>    MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LInverseTransform¡¯.
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
>    MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LColorIndexInverseTransformAlpha¡¯.
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
> MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LTransformColorInverse_C¡¯.
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
>    MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LAddGreenToBlueAndRed_C¡¯.
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
>    MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LConvertBGRAToBGR_C¡¯.
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
> MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LConvertBGRAToRGB_C¡¯.
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
>    MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LConvertBGRAToRGBA_C¡¯.
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
>    MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LConvertBGRAToRGB565_C¡¯.
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
> MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LConvertBGRAToRGBA4444_C¡¯.
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
>    MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LConvertFromBGRA¡¯.
>    MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
>    error MT5209 : Native linking error : 11 duplicate symbols for architecture arm64
>    MTOUCH : error MT5202: Native linking failed. Please review the build log.
> Done building target ¡°_CompileToNative¡± in project ¡°ARTown.iOS.csproj¡± -- FAILED.
>
> Done building project ¡°ARTown.iOS.csproj¡± -- FAILED.
>
> Build FAILED.
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
> MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LInverseTransform¡¯.
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
> MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LColorIndexInverseTransformAlpha¡¯.
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
> MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LTransformColorInverse_C¡¯.
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
> MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LAddGreenToBlueAndRed_C¡¯.
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
> MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LConvertBGRAToBGR_C¡¯.
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
> MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LConvertBGRAToRGB_C¡¯.
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
> MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LConvertBGRAToRGBA_C¡¯.
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
> MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LConvertBGRAToRGB565_C¡¯.
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
> MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LConvertBGRAToRGBA4444_C¡¯.
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
> MTOUCH : error MT5212: Native linking failed, duplicate symbol: ¡®_VP8LConvertFromBGRA¡¯.
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/WebP.a(libwebpdspdecode_la-lossless.o) (Location related to previous error)
> MTOUCH : error MT5213: Duplicate symbol in: /Users/ellazhang/Documents/work/ARTown/ARTown-Mobile/ARTown/ARTown.iOS/obj/iPhone/Debug/device-builds/ipad5.3-11.3.1/mtouch-cache/libWikitudeSDK.a(dsp.lossless.o-arm64) (Location related to previous error)
> error MT5209 : Native linking error : 11 duplicate symbols for architecture arm64
> MTOUCH : error MT5202: Native linking failed. Please review the build log.
>    2 Warning(s)
>    36 Error(s)