When I first installed postgres it was 9.4 vesrion. Then I uninstalled 9.4
and installed 9.5. I wanted to install extension, but it was installing in
9.4 directory. When I started searching for the solution, turned out that
pg_config I have is in "/usr/lib/postgresql/9.4/bin/pg_config". So what is
wrong? If my postgres server is version 9.5, where is pg_config for 9.5
version?