I updated two things at the same time and I don't know which one is to blame. I updated my copy of the 21.1 sources from CVS. I also have a brand-new glibc, built from the 2.1.1 glibc sources. Now when I try to configure XEmacs I get: buffalo:xemacs-21$ ./configure checking host system type... checking whether ln -s works... yes checking the configuration name Configuration name missing. Usage: /usr/local/src/xemacs-21/config.sub CPU-MFR-OPSYS or /usr/local/src/xemacs-21/config.sub ALIAS where ALIAS is a recognized configuration type. All that I get in config.log is this: This file contains any messages produced by compilers while running configure, to aid debugging if configure makes a mistake. configure:747: checking host system type configure:761: checking whether ln -s works configure:998: checking the configuration name Any suggestions? Thanks in advance.