Wow, this was really a mega-patch! Really amazing, Martin. I can build "Aphrodite" fine on Linux 2.0.36, but get the same crash Steve mentioned. the problem is: Fatal error: assertion failed, file /local/srcdisk/gunnar/src/XEmacs/xemacs-20/src/bytecode.c, line 1904, OPAQUEP (f->instructions) I looked a bit closer with gdb and what I saw was the following (please note that I do *not* understand anything of what is going on here, but maybe this can point Martin to the problem faster): - optimize_compiled_function is called - f->instructions is a cons and therefore: - Ffetch_bytecode is called - in here the code is fetched, but *not* copied to f->instruction (see commented line in bytecode.c:2349 ), if I execute this codeline manually in gdb, everything seems to work. OK, so this is the obvious patch: --- src/bytecode.c~ Sat Dec 5 13:02:24 1998 +++ src/bytecode.c Sat Dec 5 15:02:03 1998 ＠＠ -2346,7 +2346,7 ＠＠ ebolify_bytecode_constants (XCDR (tem)); /* VERY IMPORTANT to purecopy here!!!!! See load_force_doc_string_unwind. */ - /* f->instructions = Fpurecopy (XCAR (tem)); */ + f->instructions = Fpurecopy (XCAR (tem)); f->constants = Fpurecopy (XCDR (tem)); return function; } I recompiled and it seems to work. I'm even sending this mail from it! Please wait till Martin comments on this, I *really* have no idea what is going on here -- this is one of my "zero-knowledge patches"! I have not even read the new stuff in the internals manual. I just needed an excuse for a break from my work. HTH Gunnar -- Gunnar Evermann Speech, Vision & Robotics Group Engineering Department Cambridge University