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

https://github.com/strukturag/libheif/releases/download/v1.6.2/libheif-1.6.2.tar.gz

cd libheif-1.6.2

CC="gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -mtune=generic -Os -pipe" ./configure --prefix=/usr/local --disable-static --localstatedir=/var

[-fno-exceptions -fno-rtti fails]

find . -name Makefile -type f -exec sed -i 's/-g -O2//g' {} \;

make [0m 26.56s]
sudo make install

configure: Multithreading: yes
configure: Symbol visibility: yes
configure: libde265 decoder: no
configure: libx265 encoder: yes
configure: JPEG output: yes
configure: PNG output: yes
configure: GdkPixbuf2 loader: yes
configure: Examples: yes
configure: Tests:  (tests will cause 'visibility' to be turned off)