# in httpd.conf of Apache 2.4
LoadModule fcgid_module modules/mod_fcgid.so
<IfModule fcgid_module>
        #FcgidIPCDir "/tmp/fcgidsock"
        FcgidMaxProcessesPerClass 100
</IfModule>
<Directory "/usr/local/my_site">
    Require all granted
</Directory>

<Location />
    SetHandler fcgid-script
    Options +ExecCGI
    FcgidWrapper "/usr/local/my_site/bin/start-fcgi.sh" virtual
    Require all granted
</Location>

# in start-fcgi.sh is just one line after shebang:
#   exec plackup -s FCGI app.psgi