During build I encounter the following undefined libavcodec/libavcodec.so: undefined reference to `ff_hevcdsp_init_arm'. Seems related to the patch shown on the link at URL Reproducible: Always
+ 12 Mar 2015; Alexis Ballier <aballier@gentoo.org> ffmpeg-2.6.ebuild, + +files/noneon.patch: + backport upstream fix to fix build on arm without neon, bug #543000 + thx