I'm attempt to crossbuild openjdk-11 for ARCH=aarch64, but the build is currently failing when it checks the bootstrap: ... checking if packaged modules are kept... yes (default) checking for version string... 11.0.5+10-1 configure: Found potential Boot JDK using configure arguments configure: Potential Boot JDK found at /usr/local/bootstrap-openjdk11 is incorre ct JDK version (#); ignoring configure: (Your Boot JDK version must be one of: 10 11) configure: error: The path given by --with-boot-jdk does not contain a valid Boo t JDK configure exiting with result code 1 ===> Script "configure" failed unexpectedly. Please report the problem to java@FreeBSD.org [maintainer] and attach the "/construction/xports/java/openjdk11/work/openjdk-jdk11u-jdk-11.0.5-10-1/config. log" 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).
Looks like a problem with qemu-aarch64-static instead. The bootstrap-java binary fails with SIGILL on the crossbuild host, but succeeds an a native RPI3 host.