where we need a way to get to gcc-libs/libestdc++. This happened to work so far except when it didn't (slight differences between built and already installed llvm packages, maybe?), as found the hard way by cwen@. Our COMPILER support automatically amends WANTLIB and LIB_DEPENDS, so use those to explicitely set: - WANTLIB-main and WANTLIB-lldb - LIB_DEPENDS-main and LIB_DEPENDS-lldb