Hello, I am working on ubuntu 18.04 with LibreOffice master branch. After same warning "* WARNING : Unable to find the default value for jdk.net.URLClassPath.ClassPathURLCheck - java tests might fail!" autogen.input has enable debug and debug util. After even make build-nocheck build fails every time with following error: [DEP] LNK:Executable/gtktiledviewer [LNK] Executable/gtktiledviewer [GPK] odk_doxygen [JDC] CustomTarget/odk/docs/java/ref/javadoc_log.txt error: Source option 5 is no longer supported. Use 6 or later. error: Target option 1.5 is no longer supported. Use 1.6 or later. /media/gulsah/EK/libreoffice/odk/CustomTarget_javadoc.mk:33: recipe for target '/media/gulsah/EK/libreoffice/workdir/CustomTarget/odk/docs/java/ref/javadoc_log.txt' failed make[1]: *** [/media/gulsah/EK/libreoffice/workdir/CustomTarget/odk/docs/java/ref/javadoc_log.txt] Error 2 make[1]: *** Deleting file '/media/gulsah/EK/libreoffice/workdir/CustomTarget/odk/docs/java/ref/javadoc_log.txt' make[1]: *** Waiting for unfinished jobs.... Makefile:282: recipe for target 'build' failed make: *** [build] Error 2 i've tried with java 8 and 11 and changed JAVA_HOME according to them. How can i solve it. What does it mean error: "Source option 5 is no longer supported. Use 6 or later." Thanks -- *Gülşah Köse*