tce-load -i cmake gobject-introspection-dev icu-dev

cd libical-2.0.0

mkdir build
cd build

cmake -DCMAKE_C_FLAGS="-mtune=generic -Os -pipe" -DCMAKE_CXX_FLAGS="-mtune=generic -Os -pipe" -DCMAKE_INSTALL_PREFIX=/usr/local -DGOBJECT_INTROSPECTION=true -DSHARED_ONLY=yes -DCMAKE_BUILD_TYPE=Release ..

cp src/libical/libical_ical_export.h build/src/libical

make
sudo make install

[fix lib64 paths]