[postgres@aisprod oracle_fdw-ORACLE_FDW_2_3_0]$ echo $PATH
/usr/pgsql-13/bin:/opt/oracle/instantclient_12_2:/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin
[postgres@aisprod oracle_fdw-ORACLE_FDW_2_3_0]$ pg_config --pgxs
/usr/pgsql-13/lib/pgxs/src/makefiles/pgxs.mk
[postgres@aisprod oracle_fdw-ORACLE_FDW_2_3_0]$ ll
total 444
-rw-rw-r-- 1 postgres postgres  19790 Sep 24 12:24 CHANGELOG
drwxrwxr-x 2 postgres postgres     98 Sep 24 12:24 expected
-rw-rw-r-- 1 postgres postgres   1086 Sep 24 12:24 LICENSE
-rw-rw-r-- 1 postgres postgres   2792 Sep 24 12:24 Makefile
drwxrwxr-x 2 postgres postgres     99 Sep 24 12:24 msvc
-rw-rw-r-- 1 postgres postgres    231 Sep 24 12:24 oracle_fdw--1.0--1.1.sql
-rw-rw-r-- 1 postgres postgres    240 Sep 24 12:24 oracle_fdw--1.1--1.2.sql
-rw-rw-r-- 1 postgres postgres   1244 Sep 24 12:24 oracle_fdw--1.2.sql
-rw-rw-r-- 1 postgres postgres 207027 Sep 24 12:24 oracle_fdw.c
-rw-rw-r-- 1 postgres postgres    133 Sep 24 12:24 oracle_fdw.control
-rw-rw-r-- 1 postgres postgres   8662 Sep 24 12:24 oracle_fdw.h
-rw-rw-r-- 1 postgres postgres  44511 Sep 24 12:24 oracle_gis.c
-rw-rw-r-- 1 postgres postgres  98266 Sep 24 12:24 oracle_utils.c
lrwxrwxrwx 1 postgres postgres     17 Dec  3 22:50 README.md -> README.oracle_fdw
-rw-rw-r-- 1 postgres postgres  39629 Sep 24 12:24 README.oracle_fdw
drwxrwxr-x 2 postgres postgres     98 Sep 24 12:24 sql
-rw-rw-r-- 1 postgres postgres    237 Sep 24 12:24 TODO
[postgres@aisprod oracle_fdw-ORACLE_FDW_2_3_0]$ make
Makefile:23: /usr/pgsql-13/lib/pgxs/src/makefiles/pgxs.mk: No such file or directory
make: *** No rule to make target '/usr/pgsql-13/lib/pgxs/src/makefiles/pgxs.mk'.  Stop.
[postgres@aisprod oracle_fdw-ORACLE_FDW_2_3_0]$ sudo make
[sudo] password for postgres:
make: pg_config: Command not found
make: *** No targets.  Stop.
[postgres@aisprod oracle_fdw-ORACLE_FDW_2_3_0]$

[postgres@aisprod oracle_fdw-ORACLE_FDW_2_3_0]$ make
gcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Werror=vla -Wendif-labels -Wmissing-format-attribute -Wimplicit-fallthrough=3 -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -Wno-format-truncation -W

..........................................

12.2/client64/lib -L/usr/lib/oracle/12.1/client/lib -L/usr/lib/oracle/12.1/client64/lib -L/usr/lib/oracle/11.2/client/lib -L/usr/lib/oracle/11.2/client64/lib -L/usr/lib/oracle/11.1/client/lib -L/usr/lib/oracle/11.1/client64/lib -L/usr/lib/oracle/10.2.0.5/client/lib -L/usr/lib/oracle/10.2.0.5/client64/lib -L/usr/lib/oracle/10.2.0.4/client/lib -L/usr/lib/oracle/10.2.0.4/client64/lib -L/usr/lib/oracle/10.2.0.3/client/lib -L/usr/lib/oracle/10.2.0.3/client64/lib
[postgres@aisprod oracle_fdw-ORACLE_FDW_2_3_0]$ sudo make install
[sudo] password for postgres:
make: pg_config: Command not found
make: *** No rule to make target 'install'.  Stop.