Does this ring any bells? This is with a recent trunk.
$ ../../gcc/trunk/configure --prefix=$HOME --enable-languages=c,fortran
--enable-maintainer-mode && make && make install
make[3]: Leaving directory `/var/work/gcc-bin/trunk/libdecnumber'
make[3]: Entering directory `/var/work/gcc-bin/trunk/gcc'
(cd ../../../gcc/trunk/gcc && aclocal -I ../config -I ..)
(cd ../../../gcc/trunk/gcc && autoconf)
configure:3123: error: possibly undefined macro: AC_REQUIRE_AUX_FILE
If this token and others are legitimate, please use
m4_pattern_allow.
See the Autoconf documentation.
make[3]: *** [../../../gcc/trunk/gcc/configure] Error 1
make[3]: Leaving directory `/var/work/gcc-bin/trunk/gcc'
make[2]: *** [all-stage1-gcc] Error 2
make[2]: Leaving directory `/var/work/gcc-bin/trunk'
make[1]: *** [stage1-bubble] Error 2
make[1]: Leaving directory `/var/work/gcc-bin/trunk'
make: *** [all] Error 2
$ autoconf
autoconf: no input file
$ autoconf --version
autoconf (GNU Autoconf) 2.59
Written by David J. MacKenzie and Akim Demaille.
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.
