Problems running the C compiler on a 3B2

[Robertson John MAJ]

While running the makefile that came with the X11R4 release tape
(from mit), several files failed to compile, exiting with
error messages that said "too many defines" and "no space".

These are preprocessor messages I think.  THe files are OK and 
don't appear to have any recursive includes.  I've plenty of
disk space.  Cany anyone help with the cause?  the cure?

Jack