kdelibs4 and soprano fail to install on El Capitan due to openjdk11-temurin dependency

[Sebastian Flothow]

I’m using MacPorts on OS X El Capitan 10.11.16, currently kdelibs4 and soprano are outdated:

$ port outdated
The following installed ports are outdated:
kdelibs4                       4.14.3_16 < 4.14.3_17     
soprano                        2.9.4_4 < 2.9.4_5


Trying to upgrade either of them fails with this output:

$ sudo port upgrade soprano
--->  Fetching archive for openjdk11-temurin
--->  Attempting to fetch openjdk11-temurin-11.0.13_0.darwin_15.x86_64.tbz2 from http://packages.macports.org/openjdk11-temurin
--->  Attempting to fetch openjdk11-temurin-11.0.13_0.darwin_15.x86_64.tbz2 from http://nue.de.packages.macports.org/openjdk11-temurin
--->  Attempting to fetch openjdk11-temurin-11.0.13_0.darwin_15.x86_64.tbz2 from http://fra.de.packages.macports.org/openjdk11-temurin
--->  Fetching distfiles for openjdk11-temurin
Error: openjdk 11.0.13 is only supported on Mac OS X 10.12 Sierra or later.
Error: Failed to fetch openjdk11-temurin.
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_java_openjdk/openjdk11-temurin/main.log for details.
Error: Problem while installing openjdk11-temurin
Error: Follow https://guide.macports.org/#project.tickets if you believe there is a bug.


kdelibs4 depends on soprano, soprano depends on openjdk11, openjdk11 is a meta port wich depends on openjdk11-temurin, openjdk11-temurin requires Sierra or later, so these dependencies seem impossible to fulfill. Is there some way around this?