cd /usr/local/src/
git clone https://github.com/netkiller/mysql-outfile-plugin.git
cd mysql-outfile-plugin/

yum install -y cmake3 mysql-community-devel

cmake3 .
make
make install

or

gcc -O3  -g  -I/usr/include/mysql -I/usr/include  -fPIC -lm -lz -shared -o liboutfile.so outfile.c
sudo mv liboutfile.so /usr/lib/mysql/plugin/

create function out2file returns string soname 'liboutfile.so';

drop function out2file;

mysql> create function out2file returns string soname 'liboutfile.so';
Query OK, 0 rows affected (0.00 sec)

mysql> select out2file('/tmp/myoutfile',"Helloworld!!!");
+--------------------------------------------+
| out2file('/tmp/myoutfile',"Helloworld!!!") |
+--------------------------------------------+
| true                                       |
+--------------------------------------------+
1 row in set (0.00 sec)

root@netkiller ~/mysql-outfile-plugin % cat /tmp/myoutfile
Helloworld!!!