The programs needed to create and run a PostgreSQL server
PostgreSQL is an advanced Object-Relational database management system (DBMS). The postgresql-server package contains the programs needed to create and run a PostgreSQL server, which will in turn allow you to create and maintain PostgreSQL databases.
acquired package info from repodata DB: repodata/cf27bfca715cda3635e8d5160a35e291c72db2ae9f8cb76bb218ac2bdebdd652-primary.sqlite.bz2
The Tcl procedural language for PostgreSQL
The postgresql-pltcl package contains the PL/Tcl procedural language, which is an extension to the PostgreSQL database server. Install this if you want to write database functions in Tcl.