It does not configure but I guess that is expected based on JAVA_MOD_DESC
and it requiring Internet access:
configure: error: Could not build Java modules without Java
===> Script "configure" failed unexpectedly.
Please report the problem to [hidden email] [maintainer] and attach the
including the output of the failure of your make command. Also, it might be
a good idea to provide an overview of all packages installed on your system
(e.g. a /usr/local/sbin/pkg-static info -g -Ea).
*** Error code 1
make: stopped in /usr/ports/sysutils/syslog-ng