framework/base/libsrc/README.txt
SCIPIO: This folder is for ivy-downloaded source JARs (*-sources.jar).
Can be populated from project root using:
./ant init-lib-update-withsources
./ant init-lib-update-withsources-force
The former can fail to detect changes or lack of source JARs,
hence you may need to use the latter.
To download source jars during build:
./ant build -Dlib.update.sources=true
./ant build -Dlib.update.sources=true -Dlib.update.force=true