missing Percona-server-devel for version 5.6 in debian apt

apt-cache search libpercona

libperconaserverclient-dev - Percona Server database development files
libperconaserverclient18 - Percona Server database client library
libperconaserverclient18-dev - Percona Server database development files
libperconaserverclient18.1 - Percona Server database client library
libperconaserverclient18.1-dev - Percona Server database development files

In your case install libperconaserverclient18.1-dev, please try it out and let us know.