mod_fcgid

https://httpd.apache.org/mod_fcgid/

mod_fcgid is a high performance alternative to mod_cgi or mod_cgid, which starts a sufficient number instances of the CGI program to handle concurrent requests, and these programs remain running to handle further incoming requests.

   1 wget http://mirrors.up.pt/pub/apache//httpd/mod_fcgid/mod_fcgid-2.3.9.tar.bz2
   2 tar xvif mod_fcgid-2.3.9.tar.bz2 
   3 cd mod_fcgid-2.3.9
   4 ./configure.apxs 
   5 make
   6 make install
   7 /usr/lib/httpd/modules/mod_fcgid.so
   8 # /etc/httpd/httpd.conf
   9 # LoadModule fcgid_module lib/httpd/modules/mod_fcgid.so
  10

fcgi library

https://opensource.apple.com/source/FastCGI/FastCGI-4/fcgi/doc/fastcgi-whitepaper/fastcgi.htm

   1 cd /tmp/
   2 wget https://slackbuilds.org/slackbuilds/14.2/libraries/fcgi.tar.gz
   3 tar xvzf fcgi.tar.gz 
   4 cd fcgi
   5 wget https://sourceforge.net/projects/slackbuildsdirectlinks/files/fcgi/fcgi-2.4.0.tar.gz
   6 ./fcgi.SlackBuild 
   7 installpkg  /tmp/fcgi-2.4.0-i486-1_SBo.tgz