tce-load -i compiletc cmake

wget http://anduin.linuxfromscratch.org/BLFS/x265/x265_3.4.tar.gz

cd x265_3.4

mkdir bld
cd bld

cmake -DCMAKE_INSTALL_PREFIX=/usr/local -DCMAKE_C_FLAGS_RELEASE="-march=armv8-a+crc -mtune=cortex-a72 -Os -pipe -DNDEBUG" -DCMAKE_CXX_FLAGS_RELEASE="-march=armv8-a+crc -mtune=cortex-a72 -Os -pipe -fno-exceptions -DNDEBUG" -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=TRUE ../source

[-fno-rtti fails]

make [2m 59.17s]
sudo make install