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drivers/staging/media/sunxi/cedar/ion/ion.c:1026:2: error: unknown field ‘map’ specified in initializer
  .map = ion_dma_buf_kmap,
  ^
drivers/staging/media/sunxi/cedar/ion/ion.c:1026:9: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
  .map = ion_dma_buf_kmap,
         ^
drivers/staging/media/sunxi/cedar/ion/ion.c:1026:9: note: (near initialization for ‘dma_buf_ops.mmap’)
drivers/staging/media/sunxi/cedar/ion/ion.c:1027:2: error: unknown field ‘unmap’ specified in initializer
  .unmap = ion_dma_buf_kunmap,
  ^
drivers/staging/media/sunxi/cedar/ion/ion.c:1027:11: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
  .unmap = ion_dma_buf_kunmap,

Allwinner CedarX userspace library
Based on lindenis-v536 SDK

Add package to buildroot system
Copy dir "buildroot-package/libcedarc" to "buildroot/package"

Modify "buildroot/package/Config.in", add package source to any menu you want

source "package/libcedarc/Config.in"
Demo

menu "Hardware handling"
source "package/libcedarc/Config.in" # <--Add
source "package/acsccid/Config.in"
source "package/bcm2835/Config.in"


Build
make menuconfig
Select "libcedarc" package
make
Work with ffmpeg (tested with buildroot 2020.02.1)
make menuconfig
goto "> Target packages > Audio and video applications > ffmpeg"
set "(--enable-omx) Additional parameters for ./configure"
recompile ffmpeg