tce-load -i compiletc cmake gdk-pixbuf2-dev x265-dev

wget https://github.com/strukturag/libheif/releases/download/v1.17.6/libheif-1.17.6.tar.gz

cd libheif-1.17.6

mkdir build
cd build

cmake -LAH -DCMAKE_C_FLAGS_RELEASE="-flto -mtune=generic -Os -pipe" -DCMAKE_CXX_FLAGS_RELEASE="-flto -mtune=generic -Os -pipe" -DCMAKE_INSTALL_PREFIX=/usr/local -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=TRUE ../

[-fno-exceptions -fno-rtti fails]

make [1m 37.71s]
sudo make install

=== Summary of compiled codecs ===
libde265 HEVC decoder        : - not found
FFMPEG HEVC decoder (HW acc) : - disabled
x265 HEVC encoder            : + built-in
Kvazaar HEVC encoder         : - disabled
AOM AV1 decoder              : + built-in
AOM AV1 encoder              : + built-in
Dav1d AV1 decoder            : - disabled
SVT AV1 encoder              : - disabled
Rav1e AV1 encoder            : - disabled
JPEG decoder                 : - disabled
JPEG encoder                 : - disabled
OpenJPEG J2K decoder         : - disabled
OpenJPEG J2K encoder         : - disabled