sudo luarocks install luasql-mysql
Installing https://luarocks.org/luasql-mysql-2.3.5-1.rockspec

Error: Could not find header file for MYSQL
  No file mysql.h in /usr/local/include
  No file mysql.h in /usr/include
You may have to install MYSQL in your system and/or pass MYSQL_DIR or MYSQL_INCDIR to the luarocks command.
Example: luarocks install luasql-mysql MYSQL_DIR=/usr/local