Install Onboard for BLFS 8.2

1. Install hunspell

1.1 extract the source code package
1.2 execute:
autoreconf -vfi
./configure --prefix=/usr --sysconfdir=/etc
make
make install
ldconfig

2. Install python distutils extra

2.1 extract the source code package
2.2 execute:
python3 setup.py build
python3 setup.py install --optimize=1


3. Install Onboard

3.1 extract the source code package
3.2 execute:

python3 setup.py build
python3 setup.py install --optimize=1

glib-compile-schemas /usr/share/glib-2.0/schemas