🚀 go-pugleaf

I'm building a sun3 and sun4 hosted cross-compiler to a local m68k
target.  I'm trying to minimize duplication of cross-compiler libraries,
header files, etc between the sun3 and sun4.  It seems I'm not getting
what I want from the various dir settings in the Makefile. 

Should $(tooldir) should be split between host-dependent and
host-independent files (ie, sun4 binary gnu-as separate from target
header files), or at least made host-specific as $(exec_prefix)/$(target)?

Also, shouldn't $(bindir) be set to $(tooldir)/bin so I can have a PATH
with $(exec_prefix)/$(target)/bin?  Finally, should
STANDARD_STARTFILE_PREFIX be set to $(tooldir)/lib rather than libdir? 
If anyone else has tried this kind of setup I'd like to hear what worked
best. 

-Scott