xemacs: configure:2412:10: fatal error: 'features.h' file not found

[wealthychef1]

xemacs fails to install for me using MacPorts 2.6.4 on Big Sur:

--->  Attempting to fetch xemacs-mule-sumo-2010-07-27.tar.gz from https://lil.fr.distfiles.macports.org/xemacs
--->  Verifying checksums for xemacs
--->  Extracting xemacs
--->  Applying patches to xemacs
--->  Configuring xemacs
Error: Failed to configure xemacs, consult /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_editors_xemacs/xemacs/work/xemacs-21.4.22/config.log
Error: Failed to configure xemacs: configure failure: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_editors_xemacs/xemacs/main.log for details.

root@Richs-iMac (~ ): grep error /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_editors_xemacs/xemacs/work/xemacs-21.4.22/config.log
configure:2412:10: fatal error: 'features.h' file not found
1 error generated.
#error Not a GNU libc system :-(
clang: error: linker command failed with exit code 1 (use -v to see invocation)
/* Override any gcc2 internal prototype to avoid an error.  */
clang: error: linker command failed with exit code 1 (use -v to see invocation)
configure:3516:10: fatal error: 'a.out.h' file not found
1 error generated.
configure:3516:10: fatal error: 'elf.h' file not found
1 error generated.
configure:3516:10: fatal error: 'cygwin/version.h' file not found
1 error generated.
configure:3516:10: fatal error: 'sys/pstat.h' file not found
1 error generated.
configure:3663:67: error: implicitly declaring library function 'exit' with type 'void (int) __attribute__((noreturn))' [-Werror,-Wimplicit-function-declaration]
1 error generated.
configure:4449:2: error: use of undeclared identifier 'not'
1 error generated.
configure:4519:11: error: implicitly declaring library function 'exit' with type 'void (int) __attribute__((noreturn))' [-Werror,-Wimplicit-function-declaration]
1 warning and 1 error generated.

I'm attaching the referenced log file.