postgresql-server-dev-13 - 13.14-0+deb11u1 main

Header files for compiling SSI code to link into PostgreSQL's backend; for
example, for C functions to be called from SQL.
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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.
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PostgreSQL is an object-relational SQL database management system.