/usr/share/SuperCollider/SCClassLibrary/Common/Streams/ is in supercollider-common 1:3.4.5-1wheezy1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/BasicOpsStream.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/ControlPatterns.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/EventStreamCleanup.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/FilterPatterns.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/FuncStreamAsRoutine.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/History.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/IOStream.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/ListPatterns.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/NodeEvents.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/PatternCategories.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/PatternConductor.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/Patterns.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/Penv.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/Pfx.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/PgeneralHid.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/Plambda.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/PmonoStreams.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/Ppar.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/Ppatmod.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/Pproto.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/Prewrite.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/Pseed.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/Pspawner.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/Quant.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/RandomDistPatterns.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/Stream.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/TabFileReader.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/TimePatterns.sc
/usr/share/SuperCollider/SCClassLibrary/Common/Streams/extEnv.sc