postgresql-server-dev-11 - 11.16-0+deb10u1 main

Header files for compiling SSI code to link into PostgreSQL's backend; for
example, for C functions to be called from SQL.
.
This package also contains the Makefiles necessary for building add-on
modules of PostgreSQL, which would otherwise have to be built in the
PostgreSQL source-code tree.
.
PostgreSQL is an object-relational SQL database management system.