"configure" fails on Ubuntu 22.04 LTS (WSL2)

[SomeoneElseOSM]

https://gnucobol.sourceforge.io/faq/index.html#does-gnucobol-support-any-sql-databases
suggests "Coded for ./configure; make; make check && sudo make install"

https://github.com/opensourcecobol/Open-COBOL-ESQL/blob/master/README#L77
suggests the same thing

Postgres is installed:

libpq5/jammy-updates,jammy-security,now 14.7-0ubuntu0.22.04.1 amd64 [installed,automatic]
postgis/jammy,now 3.2.0+dfsg-1ubuntu1 amd64 [installed]
postgis-doc/jammy,now 3.2.0+dfsg-1ubuntu1 all [installed,automatic]
postgresql/jammy,now 14+238 all [installed]
postgresql-14/jammy-updates,jammy-security,now 14.7-0ubuntu0.22.04.1 amd64 [installed,automatic]
postgresql-14-postgis-3/jammy,now 3.2.0+dfsg-1ubuntu1 amd64 [installed]
postgresql-14-postgis-3-scripts/jammy,now 3.2.0+dfsg-1ubuntu1 all [installed]
postgresql-client-14/jammy-updates,jammy-security,now 14.7-0ubuntu0.22.04.1 amd64 [installed,automatic]
postgresql-client-common/jammy,now 238 all [installed,automatic]
postgresql-common/jammy,now 238 all [installed,automatic]
postgresql-contrib/jammy,now 14+238 all [installed]

I've also done:

sudo apt install postgresql-server-dev-14
sudo apt install g++

"postgresql-server-dev-14" brought in "libpq-dev" among other things, and:

$ find /usr/include -name libpq-fe.h -print
/usr/include/postgresql/libpq-fe.h

I configure and make:
./configure
(snip)

$ make
make  all-recursive
make[1]: Entering directory '/home/ajtown/src/Open-COBOL-ESQL'
Making all in dblib
make[2]: Entering directory '/home/ajtown/src/Open-COBOL-ESQL/dblib'
/bin/bash ../libtool  --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..    -lpq -O2 -MT ocesql.lo -MD -MP -MF .deps/ocesql.Tpo -c -o ocesql.lo ocesql.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -lpq -O2 -MT ocesql.lo -MD -MP -MF .deps/ocesql.Tpo -c ocesql.c  -fPIC -DPIC -o .libs/ocesql.o
In file included from ocdb.h:33,
             from ocesql.h:22,
             from ocesql.c:29:
ocpgsql.h:21:10: fatal error: libpq-fe.h: No such file or directory
   21 | #include <libpq-fe.h>
      |          ^~~~~~~~~~~~
compilation terminated.
make[2]: *** [Makefile:418: ocesql.lo] Error 1
make[2]: Leaving directory '/home/ajtown/src/Open-COBOL-ESQL/dblib'
make[1]: *** [Makefile:393: all-recursive] Error 1
make[1]: Leaving directory '/home/ajtown/src/Open-COBOL-ESQL'
make: *** [Makefile:324: all] Error 2

Any suggestions?

[SomeoneElseOSM]

Obviously I'm aware of a bunch of other issues at https://github.com/opensourcecobol/Open-COBOL-ESQL/issues?q=is%3Aissue+configure , but nothing exactly the same as this. If there was some actual documentation that explained what "configure" and "make" are doing here (beyond the obvious) it may be possible for people to figure out what the problem is.

[SomeoneElseOSM]

Actually, I should have read a couple of lines further down: https://github.com/opensourcecobol/Open-COBOL-ESQL/blob/master/README#L83 "For use with PostgreSQL 9.0 or later" :)

Doing "export CPPFLAGS=..." (but for the actual location that's valid for me, "/usr/include/postgresql") gets me further. PostgreSQL 9 was released in 2010 (when some young chap called Barack Obama had just become president). If I can get something working I'll see what else needs changing and submit a PR for the readme.