Вопрос Где находятся pg_config и pg_hba.conf?

checking for pg_config... no
No pg_config... trying anyway. If building fails, please try again with
 --with-pg-config=/path/to/pg_config
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

sudo find / -name "pg_config" -print
find: ‘/run/user/1000/gvfs’: Отказано в доступе
/usr/bin/pg_config
/usr/lib/postgresql10/bin/pg_config
/etc/alternatives/pg_config

> psql -U postgres
=# show hba_file;
=# show config_file

cat  /usr/lib/systemd/system/postgresql.service
cat /etc/sysconfig/postgresql
systemctl status postgresql | grep vendor
cat /lib/systemd/system/postgresql@.service | grep Condi
sudo ps aux | grep postgresql |grep bin

test@test:~$ sudo su - postgres
[sudo] password for test: 
postgres@test:~$

postgres@test:~$ psql -U postgres
psql (9.1.12)
Type "help" for help.

postgres=#

postgres=# ALTER USER postgres with encrypted password '12345689';
ALTER ROLE

postgres=# \q
postgres@test:~$

local   all             postgres                                peer

local   all             postgres                                md5

sudo /etc/init.d/postgresql restart

psql -U postgres

$ locate pg_hba.conf

default: &default
  adapter: postgresql
  encoding: unicode
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>

development:
  <<: *default
  database: redmine_development