UPDATE:
Just found this: https://github.com/neos/flow-development-collection/pull/187/files
Workaround until NEOS 3.0: https://github.com/mittwald/flow-symlink-publishing
From NEOS 3.X, add these lines to Settings.yaml to enable relative symlinks:
Neos:
Flow:
resource:
targets:
localWebDirectoryPersistentResourcesTarget:
target: 'Neos\Flow\ResourceManagement\Target\FileSystemSymlinkTarget'
targetOptions:
relativeSymlinks: true
localWebDirectoryStaticResourcesTarget:
target: 'Neos\Flow\ResourceManagement\Target\FileSystemSymlinkTarget'
targetOptions:
relativeSymlinks: true