how to build [apache lucy](https://lucy.apache.org/), install libraries and includes and then compile and run one of its samples (linux)

lucy_build_and_run_example.sh

# The following shell script demonstrate how to build apache lucy https://lucy.apache.org/
# compile one of its sample and run it in a linux system. 

# IMPORTANT: change variables FOLDER and PREFIX according to your system

FOLDER=/home/sg/test

PREFIX=/usr # where includes and libs will be installed in your system

mkdir -p $FOLDER
cd $FOLDER

git clone https://git-wip-us.apache.org/repos/asf/lucy-clownfish.git
cd $FOLDER/lucy-clownfish/runtime/c
./configure --prefix=$PREFIX
make 
make install  

cd $FOLDER/lucy-clownfish/compiler/c
./configure --prefix=$PREFIX
make 
make install  

cd $FOLDER
git clone https://git-wip-us.apache.org/repos/asf/lucy.git
cd $FOLDER/lucy/c
./configure --prefix=$PREFIX
make
make install

cp -rf $FOLDER/lucy/c/autogen/include/* $PREFIX/include



# now compile a lucy example and run it:
cd $FOLDER/lucy/c/sample
gcc getting_started.c -l clownfish -l lucy -o getting_started.out
./getting_started.out