=> Bootstrap dependency digest>=20010302: found digest-20190127
===> Skipping vulnerability checks.
WARNING: No /var/db/pkg/pkg-vulnerabilities file found.
WARNING: To fix run: `/usr/sbin/pkg_admin -K /var/db/pkg fetch-pkg-vulnerabilities'.
===> Building for opengrok-0.12.1.5nb14
java.lang.ClassFormatError: Invalid constant type 18 in class
   at org.apache.tools.ant.launch.Launcher.main (Launcher.java:101)
*** Error code 2

Stop.
make[1]: stopped in /usr/pkgsrc/devel/opengrok
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/devel/opengrok