tce-load -i compiletc cmake ninja libaom-dev libde265-dev x265-dev brotli-dev dav1d-dev gdk-pixbuf2-dev libwebp1-dev openjpeg-dev x264_165-dev

wget https://github.com/strukturag/libheif/releases/download/v1.21.2/libheif-1.21.2.tar.gz

wget https://www.linuxfromscratch.org/patches/blfs/svn/libheif-1.21.2-svt_av1_build_fix-1.patch

cd libheif-1.21.2

patch -Np1 -i ../libheif-1.21.2-svt_av1_build_fix-1.patch
patch -Np1 -i ../libheif.patch

find . -name encoder_svt.cc -type f -exec sed -i 's/SvtAv1PredStructure/PredStructure/g;s/SVT_AV1_PRED_//g' {} \;

mkdir build
cd build

cmake -LAH -DCMAKE_C_FLAGS_RELEASE="-flto -march=i486 -mtune=i686 -Os -pipe" -DCMAKE_CXX_FLAGS_RELEASE="-flto -march=i486 -mtune=i686 -Os -pipe" -DCMAKE_INSTALL_PREFIX=/usr/local -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=TRUE -DWITH_DAV1D=ON -DWITH_JPEG_ENCODER=ON -DWITH_JPEG_DECODER=ON -DWITH_OpenJPEG_ENCODER=ON -DWITH_OpenJPEG_DECODER=ON -DWITH_SvtEnc=ON -DWITH_OpenH264_DECODER=OFF -G Ninja ../

[-fno-rtti fails]

ninja [4m 24.17s]
sudo ninja install

=== Summary of compiled codecs ===
libde265 HEVC decoder                 : + built-in
FFMPEG HEVC decoder (HW acc)          : - disabled
WebCodecs HEVC decoder (experimental) : - disabled
x265 HEVC encoder                     : + built-in
Kvazaar HEVC encoder                  : - disabled
AOM AV1 decoder                       : + built-in
AOM AV1 encoder                       : + built-in
Dav1d AV1 decoder                     : + separate plugin
SVT AV1 encoder                       : + separate plugin
Rav1e AV1 encoder                     : - disabled
JPEG decoder                          : + built-in
JPEG encoder                          : + built-in
x264 AVC encoder                      : + built-in
OpenH264 decoder                      : - disabled
OpenJPEG J2K decoder                  : + separate plugin
OpenJPEG J2K encoder                  : + separate plugin
OpenJPH HT-J2K encoder                : - disabled
uvg266 VVC encoder                    : - disabled
vvenc VVC encoder                     : - disabled
vvdec VVC decoder                     : - disabled

=== Supported formats ===
format        decoding   encoding
AVC             NO         YES
AVIF            YES        YES
HEIC            YES        YES
JPEG            YES        YES
JPEG2000        YES        YES
JPEG2000-HT     YES        NO 
Uncompressed    NO         NO 
VVC             NO         NO 

=== Active input formats for heif-enc ===
JPEG: active
PNG:  active
TIFF: active