Build PostgreSQL manually with uuid

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/10/static/uuid-ossp.html
Description:

Following the documentation at
https://www.postgresql.org/docs/10/static/install-procedure.html and
configuring the option --with-uuid=ossp won't build the uuid-ossp extension
at the following make / make install steps. For this, I need to change to
./contrib/uuid-ossp and execute an additional make / make install from
there. This is missing in the documentation.