We cannot use Liquibase since version 3 because of missing schema support. I had a look at the sources and deleted in class liquibase.database.coreInformixDatabase.java the overriding methods: getDefaultSchemaName(), supportsSchemas() and supportsPrimaryKeyNames(). I also didi a maven-build, ran an "update" and it worked. I am not sure on how to commit these changes so I created this ticket.
Informix IDS 11.7 on Linux
Fixed with PullRequest 199