Hello Hans. I checked the stubs.h file, and it looks for stubs-32 or stubs-64 depending on a variable __WORDSIZE. Obviously it was looking for 32, and 64 was right there, but I left it alone, not sure where this variable was set.
Also, xlibs-dev has apparently been split into many packages in testing. I haven't yet installed them, not sure which are necessary.
Awaiting further instructions.
-Chuckk