Getting dangerously close to being able to build TOS from source

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Getting dangerously close to being able to build TOS from source

I have managed to get the install process running, generally OK but have hit the error shown below:
The path given /is/ accessible from the host machine but no content.xml file exists in:
https://artifacts-oss.talend.com/nexus/content/unzip/TalendP2UnzipOpenSourceSnapshot/org/talend/repo...
Any idea what I need to do to get around this and have maven correctly pull down the snapshot dependencies?

 Internal error: java.lang.RuntimeException: Failed to load p2 repository with ID 'tos-deps' from location https://artifacts-oss.talend.com/nexus/content/unzip/TalendP2UnzipOpenSourceSnapshot/org/talend/repo/dependencies.p2.tos/6.4.0-SNAPSHOT/dependencies.p2.tos-6.4.0-SNAPSHOT.zip-unzip/: Unknown Host: https://artifacts-oss.talend.com/nexus/content/unzip/TalendP2UnzipOpenSourceSnapshot/org/talend/repo/dependencies.p2.tos/6.4.0-SNAPSHOT/dependencies.p2.tos-6.4.0-SNAPSHOT.zip-unzip/content.xml: Unknown host artifacts-oss.talend.com -> 
org.apache.maven.InternalErrorException: Internal error: java.lang.RuntimeException: Failed to load p2 repository with ID 'tos-deps' from location https://artifacts-oss.talend.com/nexus/content/unzip/TalendP2UnzipOpenSourceSnapshot/org/talend/repo/dependencies.p2.tos/6.4.0-SNAPSHOT/dependencies.p2.tos-6.4.0-SNAPSHOT.zip-unzip/
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:168)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: java.lang.RuntimeException: Failed to load p2 repository with ID 'tos-deps' from location https://artifacts-oss.talend.com/nexus/content/unzip/TalendP2UnzipOpenSourceSnapshot/org/talend/repo/dependencies.p2.tos/6.4.0-SNAPSHOT/dependencies.p2.tos-6.4.0-SNAPSHOT.zip-unzip/
        at org.eclipse.tycho.p2.target.TargetPlatformFactoryImpl.loadMetadataRepository(TargetPlatformFactoryImpl.java:301)
        at org.eclipse.tycho.p2.target.TargetPlatformFactoryImpl.gatherExternalInstallableUnits(TargetPlatformFactoryImpl.java:269)
        at org.eclipse.tycho.p2.target.TargetPlatformFactoryImpl.createTargetPlatform(TargetPlatformFactoryImpl.java:174)
        at org.eclipse.tycho.p2.target.TargetPlatformFactoryImpl.createTargetPlatform(TargetPlatformFactoryImpl.java:126)
        at org.eclipse.tycho.p2.target.TargetPlatformFactoryImpl.createTargetPlatform(TargetPlatformFactoryImpl.java:1)
        at org.eclipse.tycho.p2.manager.ReactorRepositoryManagerImpl.computePreliminaryTargetPlatform(ReactorRepositoryManagerImpl.java:82)
        at org.eclipse.tycho.p2.resolver.P2DependencyResolver.computePreliminaryTargetPlatform(P2DependencyResolver.java:221)
        at org.eclipse.tycho.core.resolver.DefaultTychoResolver.resolveProject(DefaultTychoResolver.java:109)
        at org.eclipse.tycho.core.maven.TychoMavenLifecycleParticipant.afterProjectsRead(TychoMavenLifecycleParticipant.java:77)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:274)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
        ... 11 more
Caused by: org.eclipse.equinox.p2.core.ProvisionException: Unknown Host: https://artifacts-oss.talend.com/nexus/content/unzip/TalendP2UnzipOpenSourceSnapshot/org/talend/repo/dependencies.p2.tos/6.4.0-SNAPSHOT/dependencies.p2.tos-6.4.0-SNAPSHOT.zip-unzip/content.xml
        at org.eclipse.equinox.internal.p2.repository.CacheManager.createCache(CacheManager.java:192)
        at org.eclipse.tycho.p2.remote.RemoteRepositoryCacheManager.createCache(RemoteRepositoryCacheManager.java:66)
        at org.eclipse.equinox.internal.p2.metadata.repository.SimpleMetadataRepositoryFactory.getLocalFile(SimpleMetadataRepositoryFactory.java:66)
        at org.eclipse.equinox.internal.p2.metadata.repository.SimpleMetadataRepositoryFactory.load(SimpleMetadataRepositoryFactory.java:88)
        at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.factoryLoad(MetadataRepositoryManager.java:57)
        at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:768)
        at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:668)
        at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:96)
        at org.eclipse.tycho.p2.remote.RemoteMetadataRepositoryManager.loadRepository(RemoteMetadataRepositoryManager.java:59)
        at org.eclipse.tycho.p2.remote.RemoteMetadataRepositoryManager.loadRepository(RemoteMetadataRepositoryManager.java:52)