tce-load -i compiletc cmake gobject-introspection-dev icu-dev perl5 libxml2-dev

https://github.com/libical/libical/releases/download/v3.0.8/libical-3.0.8.tar.gz

cd libical-3.0.8

mkdir build
cd build

cmake -LAH -DCMAKE_C_FLAGS_RELEASE="-Os -pipe -march=armv8-a+crc -mtune=cortex-a72" \
-DCMAKE_CXX_FLAGS_RELEASE="-std=c++11 -Os -pipe -march=armv8-a+crc -mtune=cortex-a72" \
-DCMAKE_INSTALL_PREFIX=/usr/local -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=TRUE \
-DSHARED_ONLY=yes -DICAL_BUILD_DOCS=false -DGOBJECT_INTROSPECTION=true ../

make [2m 53.83s]
sudo make install