=> Bootstrap dependency digest>=20010302: found digest-20190127
===> Building for opengrok-0.12.1.5nb11
cd /tmp/pkgbuild/devel/opengrok/work.alpha/OpenGrok-0.12.1.5 &&  CLASSPATH=/usr/pkg/lib/java/JFlex.jar /usr/pkg/bin/ant
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