error: package com.jogamp.common does not exist

Hello, Trying to build jogamp-jogl 2.6.0 on FreeBSD with JDK-21 fails with this message:

java.generate.copy2temp:
     [echo] 
     [echo] GlueGen has successfully generated files.

javah.drmgbm:

javah.x11:
    [javac] Compiling 2 source files to /usr/ports/graphics/jogamp-jogl-2.6.0/work/jogl/build/nativewindow/classes
    [javac] warning: [options] source value 8 is obsolete and will be removed in a future release
    [javac] warning: [options] target value 8 is obsolete and will be removed in a future release
    [javac] warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
    [javac] /usr/ports/graphics/jogamp-jogl-2.6.0/work/jogl/src/nativewindow/classes/jogamp/nativewindow/x11/X11Util.java:48: error: package com.jogamp.common does not exist
    [javac] import com.jogamp.common.ExceptionUtils;
    [javac]                         ^
    [javac] /usr/ports/graphics/jogamp-jogl-2.6.0/work/jogl/src/nativewindow/classes/jogamp/nativewindow/x11/X11Util.java:49: error: package com.jogamp.common.util does not exist
    [javac] import com.jogamp.common.util.LongObjectHashMap;
    [javac]                              ^
    [javac] /usr/ports/graphics/jogamp-jogl-2.6.0/work/jogl/src/nativewindow/classes/jogamp/nativewindow/x11/X11Util.java:50: error: package com.jogamp.common.util does not exist
    [javac] import com.jogamp.common.util.PropertyAccess;
    [javac]                              ^
    [javac] /usr/ports/graphics/jogamp-jogl-2.6.0/work/jogl/src/nativewindow/classes/jogamp/nativewindow/x11/X11Util.java:172: error: cannot find symbol
    [javac]     private static LongObjectHashMap openDisplayMap = new LongObjectHashMap(); // handle -> name
    [javac]                    ^
    [javac]   symbol:   class LongObjectHashMap
    [javac]   location: class X11Util
    [javac] /usr/ports/graphics/jogamp-jogl-2.6.0/work/jogl/build/nativewindow/gensrc/classes/jogamp/nativewindow/x11/X11Lib.java:9: error: package com.jogamp.common.util does not exist
    [javac] import com.jogamp.common.util.Bitfield;
    [javac]                              ^

Beginning is:

jogamp.env.validation:
     [echo] ant.version                Apache Ant(TM) version 1.10.15 compiled on August 25 2024
     [echo] ant.java.version           21
     [echo] java.version               21.0.8
     [echo] java.home                  /usr/local/openjdk21
     [echo] jvmJava.exe                /usr/local/openjdk21/bin/java
     [echo] jvmJava8.exe               ${jvmJava8.exe}
     [echo] minJava21                  true
     [echo] minJava17                  true
     [echo] minJava11                  true
     [echo] minJava9                   true
     [echo] minJava8                   true