# Error while building synfig-core

**URL:** <https://forums.synfig.org/t/error-while-building-synfig-core/9492>\
**Category:** Building synfig\
**Tags:** libavcodec\
**Created:** [February 28, 2019, 5:47pm UTC](https://forums.synfig.org/t/error-while-building-synfig-core/9492 "2019-02-28T17:47:11Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![lenixlobo](https://forums.synfig.org/letter_avatar_proxy/v4/letter/l/a587f6/32.png) [@lenixlobo](https://forums.synfig.org/u/lenixlobo)\
**Post date:** [February 28, 2019, 5:47pm UTC](https://forums.synfig.org/t/error-while-building-synfig-core/9492/1 "2019-02-28T17:47:11Z")

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(System: Ubuntu 16.04)I tried Building using the build.sh script as well as building individual modules seperately .  
Below is the description of the error  
/synfig/synfig-core/src/modules/mod\_libavcodec/trgt\_av.cpp:199:6: error: reference to ‘AVPixelFormat’ is ambiguous  
synfig/synfig-core/src/modules/mod\_libavcodec/trgt\_av.cpp:209:53: error: ‘AVStream {aka struct AVStream}’ has no member named ‘codecpar’

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**Author:** ![KonstantinDmitriev](https://forums.synfig.org/user_avatar/forums.synfig.org/konstantindmitriev/32/3_2.png) [@KonstantinDmitriev](https://forums.synfig.org/u/KonstantinDmitriev)\
**Post date:** [February 28, 2019, 6:22pm UTC](https://forums.synfig.org/t/error-while-building-synfig-core/9492/2 "2019-02-28T18:22:29Z")

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Hmmm… it looks like we have lost compatibility with old FFmpeg.

Please open file `autobuild/build.sh` and change on line 175 from  
`--with-libavcodec`  
to  
`--without-libavcodec`

After that please try to do rebuild again.