compiling postgresql with uuid-ossp failure

I have installed idempiere ERP which requires uuid-ossp library. I have
tried to recompile postgresql-11.2 with the option --with-uuid=ossp. When
run I

CREATE EXTENSION "uuid-ossp";

I get the following error:
ERROR:  could not open extension control file
"/data/databases/postgres/pgsql11/share/extension/uuid-ossp.control": No
such file or directory.

 select * from pg_available_extensions;

gives me this list  (without uuid-ossp, of course):

 name    | default_version | installed_version |
comment
------------+-----------------+-------------------+-------------------------------------------
 pltclu     | 1.0             |                   | PL/TclU untrusted
procedural language
 pltcl      | 1.0             |                   | PL/Tcl procedural
language
 plperl     | 1.0             |                   | PL/Perl procedural
language
 plperlu    | 1.0             |                   | PL/PerlU untrusted
procedural language
 plpythonu  | 1.0             |                   | PL/PythonU untrusted
procedural language
 plpython2u | 1.0             |                   | PL/Python2U untrusted
procedural language
 plpgsql    | 1.0             | 1.0               | PL/pgSQL procedural
language
(7 rows)



 Is there a reason why this extension was not created during
compilation/installation?

Thanks