Hello, Aidan and Mike. I tried to build XEmacs today, for the first time in a long while, and got informed that: sysdep.c: In function 'strsignal': sysdep.c:3672:24: error: 'sys_siglist' undeclared (first use in this function) 3672 | return (char *) (sys_siglist[signum]); . Searching the web, I found the following on github: https://github.com/greenbone/gvmd/issues/1279: From the release notes of glibc 2.32, https://sourceware.org/pipermail/libc-announce/2020/000029.html: The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev are no longer available to newly linked binaries, and their declarations have been removed from <string.h>. They are exported solely as compatibility symbols to support old binaries. All programs should use strsignal instead. Perhaps one of you might want to have a look at this. And a happy new year to you both! -- Alan Mackenzie (Nuremberg, Germany).