/usr/share/SuperCollider/SCClassLibrary/JITLib/ProxySpace/ is in supercollider-common 1:3.4.5-1wheezy1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/SuperCollider/SCClassLibrary/JITLib/ProxySpace/BusPlug.sc
/usr/share/SuperCollider/SCClassLibrary/JITLib/ProxySpace/InBus.sc
/usr/share/SuperCollider/SCClassLibrary/JITLib/ProxySpace/NodeMap.sc
/usr/share/SuperCollider/SCClassLibrary/JITLib/ProxySpace/NodeMapSetting.sc
/usr/share/SuperCollider/SCClassLibrary/JITLib/ProxySpace/NodeProxy.sc
/usr/share/SuperCollider/SCClassLibrary/JITLib/ProxySpace/ProxyInterfaces.sc
/usr/share/SuperCollider/SCClassLibrary/JITLib/ProxySpace/ProxySpace.sc
/usr/share/SuperCollider/SCClassLibrary/JITLib/ProxySpace/ProxySynthDef.sc
/usr/share/SuperCollider/SCClassLibrary/JITLib/ProxySpace/TempoBusClock.sc
/usr/share/SuperCollider/SCClassLibrary/JITLib/ProxySpace/extStoreOn.sc
/usr/share/SuperCollider/SCClassLibrary/JITLib/ProxySpace/operators.sc
/usr/share/SuperCollider/SCClassLibrary/JITLib/ProxySpace/wrapForNodeProxy.sc