I´ve problems to compile the XEmacs 21.0 on a Linux PC (gcc 2.7.2.3, Linux 2.1.115, libc.so.5.4.44): mkdir xemacs-21.0/Linux cd xemacs-21.0/Linux setenv CONFIG `./config.guess` ../configure --prefix=/prog/xemacs/21.0 \ --exec-prefix=/prog/xemacs/21.0/$CONFIG --with-offix --with-gif \ --with-xpm --with-xface --with-ncurses --with-gpm \ --with-database=gnudbm --with-pop --with-site-lisp --with-sound=both \ --error-checking=none --site-libraries=${LD_LIBRARY_PATH} \ --site-includes=${C_INCLUDE_PATH} make : gcc -c -g -O3 -Wall -Wno-switch -I. -DHAVE_CONFIG_H -I/prog/libpng/Global/include -I/prog/faces/include -I/prog/gnu/include -I/linux/gnu/include -I/prog/libpng/Global/include -I/prog/lesstif/1.2/include -I/usr/X11R6/include -I/linux/X11R6/include -I/usr/include -I/usr/X11/include /prog/xemacs/src/xemacs-21.0/lwlib/xlwmenu.c /prog/xemacs/src/xemacs-21.0/lwlib/xlwmenu.c: In function `allocate_nearest_color': /prog/xemacs/src/xemacs-21.0/lwlib/xlwmenu.c:260: `ULONG_MAX' undeclared (first use this function) /prog/xemacs/src/xemacs-21.0/lwlib/xlwmenu.c:260: (Each undeclared identifier is reported only once /prog/xemacs/src/xemacs-21.0/lwlib/xlwmenu.c:260: for each function it appears in.) make[1]: *** [xlwmenu.o] Error 1 make[1]: Leaving directory `/source/xemacs/xemacs-21.0/Linux/lwlib' make: *** [lwlib] Error 2 Any ideas? Heiko