If you've installed a full Slackware installation you should've
alredy Apache and MySql in your system.
Lets edit some files:
at the line DirectoryIndex index.html change to index.php
at he line ServerAdmin insert your email address
uncomment (remove #) the line Include /etc/httpd/mod_php.conf
then save and exit with :wq
Edit timezone: vim /etc/httpd/php.ini
uncomment the line and add a zone: date.timezone = Europe/Rome (choose yours)
save and exit
Now run Mysql as root:
then /usr/bin/mysql_secure_installation to set password and other settigs.
chmod 755 /etc/rc.d/rc.mysqld
resart with /etc/rc.d/rc.mysqld restart
restart Apache with apachectl restart
Download Joomla installation package and unzip all the content in a folder, now as root
copy in /srv/httpd/htdocs all the folders and files with cp -r * /srv/httpd/htdocs.
With you browser and go to http://localhost where you will find the Joomla
installation procedure, once finished it will promt you to delete the installation folder:
so as root type rm -r /srv/httpd/htdocs/installation, now you can click on site or administrator
to build your offline site.
For further info read the official Slackware Apache docs at: