I recently upgraded to Postgres 9.5 simply by installing from Ubuntu package repos. Everything went smoothly in the upgrade and I regularly use Postgres and all my previous data.
However, I am also working on some C language extensions and need to import the backend header "postgres.h" -- which is not found in the Postgres include dir.
The documentation (search for 'server header files' and read the note) suggests that there should be private subdirectories under the base include directory and that server-side headers will be installed there, but this is not the case for me.
Using find to search the entire machine for "postgres.h" reveals that the only copy is in a separate directory where I downloaded an older version of the Postgres source just for reading and searching code -- not at all for supporting an installation.
I want to avoid rebuilding or reinstalling Postgres at all costs, as everything is working fine. I just need to make the headers available.
