How to install pg gem on SUSE 15.1? - ruby-on-rails

Question

With the objective of implementing Rails 5.2.4, I just installed PostgreSQL 13 on a new SUSE 15.1 server, then Ruby 2.6.6, and I am now trying to install PostgreSQL client gem: pg version 1.2.3.
I first tried to run gem install pg, which claims for missing files pg_config and libpq-fe.h:
Building native extensions. This could take a while...
ERROR: Error installing pg:
ERROR: Failed to build gem native extension.
current directory: /home/a80838986/.rbenv/versions/2.6.6/lib/ruby/gems/2.6.0/gems/pg-1.2.3/ext
/home/a80838986/.rbenv/versions/2.6.6/bin/ruby -I /home/a80838986/.rbenv/versions/2.6.6/lib/ruby/2.6.0 -r ./siteconf20201103-26887-19gz250.rb extconf.rb
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.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/home/a80838986/.rbenv/versions/2.6.6/bin/$(RUBY_BASE_NAME)
--with-pg
--without-pg
--enable-windows-cross
--disable-windows-cross
--with-pg-config
--without-pg-config
--with-pg_config
--without-pg_config
--with-pg-dir
--without-pg-dir
--with-pg-include
--without-pg-include=${pg-dir}/include
--with-pg-lib
--without-pg-lib=${pg-dir}/lib
To see why this extension failed to compile, please check the mkmf.log which can be found here:
/home/a80838986/.rbenv/versions/2.6.6/lib/ruby/gems/2.6.0/extensions/x86_64-linux/2.6.0/pg-1.2.3/mkmf.log
extconf failed, exit code 1
Gem files will remain installed in /home/a80838986/.rbenv/versions/2.6.6/lib/ruby/gems/2.6.0/gems/pg-1.2.3 for inspection.
Results logged to /home/a80838986/.rbenv/versions/2.6.6/lib/ruby/gems/2.6.0/extensions/x86_64-linux/2.6.0/pg-1.2.3/gem_make.out
Searching in the file system, I found a set of files which could fulfill gem's install requirements, but I can't find out how to run the install with these:
ls -l /usr/include/pgsql/ total 152
-rwxr-xr-x 1 root root 656 Oct 29 01:11 ecpg_config.h
-rwxr-xr-x 1 root root 2544 Oct 29 01:11 ecpgerrno.h
-rwxr-xr-x 1 root root 2803 Oct 29 01:11 ecpg_informix.h
-rwxr-xr-x 1 root root 2681 Oct 29 01:11 ecpglib.h
-rwxr-xr-x 1 root root 2709 Oct 29 01:11 ecpgtype.h
drwxr-xr-x 1 root root 8 Nov 3 12:25 informix
drwxr-xr-x 1 root root 102 Nov 3 12:25 internal
drwxr-xr-x 1 root root 20 Nov 3 12:25 libpq
-rwxr-xr-x 1 root root 2214 Oct 29 01:11 libpq-events.h
-rwxr-xr-x 1 root root 23338 Oct 29 01:11 libpq-fe.h
-rwxr-xr-x 1 root root 323 Oct 29 01:11 pg_config_ext.h
-rwxr-xr-x 1 root root 31970 Oct 29 01:11 pg_config.h
-rwxr-xr-x 1 root root 12877 Oct 29 01:11 pg_config_manual.h
-rwxr-xr-x 1 root root 1052 Oct 29 01:11 pg_config_os.h
-rwxr-xr-x 1 root root 797 Oct 29 01:11 pgtypes_date.h
-rwxr-xr-x 1 root root 530 Oct 29 01:11 pgtypes_error.h
-rwxr-xr-x 1 root root 222 Oct 29 01:11 pgtypes.h
-rwxr-xr-x 1 root root 1032 Oct 29 01:11 pgtypes_interval.h
-rwxr-xr-x 1 root root 2251 Oct 29 01:11 pgtypes_numeric.h
-rwxr-xr-x 1 root root 945 Oct 29 01:11 pgtypes_timestamp.h
-rwxr-xr-x 1 root root 2239 Oct 29 01:11 postgres_ext.h
-rwxr-xr-x 1 root root 838 Oct 29 01:11 sql3types.h
-rwxr-xr-x 1 root root 1283 Oct 29 01:11 sqlca.h
-rwxr-xr-x 1 root root 1575 Oct 29 01:11 sqlda-compat.h
-rwxr-xr-x 1 root root 321 Oct 29 01:11 sqlda.h
-rwxr-xr-x 1 root root 824 Oct 29 01:11 sqlda-native.h
The pg_config is still missing, the libpq-fe.h is there, but:
The no-pg-config option has no effect.
I dont know how to set the pass to libpq-fe.h
Can you help me finalize this installation?

Answer 1

I found out that the pg_config utility belongs to the postgresql13-server-devel package. Installing this package solved my issue.