Hi,
I guess this is a JVM System property on the SVNKit side. So the proper way to pass it to the forked JVM is by setting:
-Dsonar.scanner.javaOpts="-Dsvnkit.ssh.client=apache"- or using the equivalent env variable
SONAR_SCANNER_JAVA_OPTSto-Dsvnkit.ssh.client=apache
This is assuming you are using a recent version of the Scanner for Gradle.