Trying to build with 1.7.19 on macOS 10.12.6 (pom here) and it fails with this message:

[ERROR] Failed to execute goal com.akathist.maven.plugins.launch4j:launch4j-maven-plugin:1.7.19:launch4j (l4j-gui) on project ovtk2: Can't find platform-specific components: Could not find artifact net.sf.launch4j:launch4j:jar:workdir-osx:3.11

Going back to 1.7.16 and it seems to work. Maybe it's related to #54