Hrvoje Niksic <hniksic(a)srce.hr&gt; writes: We do (at least it seems so from lisp.h). However that is more a legacy and initialisation issue. Unexec'ing puts the pure stuff the .data segment if I am not mistaken: CONTENTS, ALLOC, LOAD, DATA 19 .data 000cd63e 00576eb8 00576eb8 00556eb8 2**3 CONTENTS, ALLOC, LOAD, DATA 20 .data1 00004176 006444f8 006444f8 006244f8 2**2 i.e. no read only. So I would say it should be possible to just not do the PURE check on unexec elf systems. So the question is now: Is XEmacs used at all on platforms which do require a true read-only purespace. Jan