Long story short: when issueing a
configure in your PostgreSQL source tree you got:
checking for readline.h... no
configure: error: readline header not found
and the
readline library is installed on the system:
% pkg info readline
readline-7.0.3_1
Name : readline
Version : 7.0.3_1
Installed on : Thu May 31 13:39:23 2018 CEST
...
So what is going wrong? Simple: the
configure script is not searching for in the correct include path, that on FreeBSD is
/usr/local/include. The problem can be easily fixed adding
--with-includes to the
configure command line, and in particular the following is the line I use to compile PostgreSQL (e.g., 11 beta 1):
% ./configure --prefix=/opt/pg11b1
--with-perl
--with-python
--with-openssl
--with-libraries=/usr/local/lib
--with-includes=/usr/local/include/
The part
--with-includes=/usr/local/include/ fixes the error on readline.