Trying to convert a .osm file with mkgmapgui, I get the following result. ron@ron:~/Downloads $ mkgmapgui Using /usr/lib/jvm/java-7-openjdk-amd64/bin/java to execute mkgmapgui. Time started: Mon Sep 15 15:54:37 PYT 2014 java.lang.NoClassDefFoundError: it/unimi/dsi/fastutil/longs/Long2ObjectOpenHashMap at uk.me.parabola.mkgmap.reader.osm.OSMId2ObjectMap.<init>(OSMId2ObjectMap.java:38) at uk.me.parabola.mkgmap.reader.osm.ElementSaver.<init>(ElementSaver.java:49) at uk.me.parabola.mkgmap.reader.osm.OsmMapDataSource.createElementSaver(OsmMapDataSource.java:170) at uk.me.parabola.mkgmap.reader.osm.OsmMapDataSource.setupHandler(OsmMapDataSource.java:152) at uk.me.parabola.mkgmap.reader.osm.xml.Osm5MapDataSource.load(Osm5MapDataSource.java:59) at uk.me.parabola.mkgmap.reader.osm.OsmMapDataSource.load(OsmMapDataSource.java:127) at uk.me.parabola.mkgmap.main.MapMaker.loadFromFile(MapMaker.java:167) at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:63) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:220) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:216) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.ClassNotFoundException: it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ... 14 more Exiting - if you want to carry on regardless, use the --keep-going option Time finished: Mon Sep 15 15:54:37 PYT 2014 Total time taken: 191ms Suffixing the command with --keep-going gives the same result. What can one do ? I am running --version does not give any version info)gui 1.1 under a debian derivative (mkgmap --version does not give any version info) Cheers, Ron. -- Two heads are better than one, as they say in the Navy. -- http://www.olgiati-in-paraguay.org --