SED Errors when building asciidoc

I get the following two warnings/errors when building asciidoc : $./configure --prefix=/home/my_installations/ ./configure: line 1233: AC_PROG_SED: command not found checking whether ln -s works... yes checking for a BSD-compatible install... /usr/bin/install -c configure: creating ./config.status config.status: creating Makefile and then also with make: $ make Fixing CONF_DIR in asciidoc.py /bin/sh: line 2: @SED@: command not found Fixing CONF_DIR in a2x.py /bin/sh: line 2: @SED@: command not found This is with the latest stable versions of automake and autoconf on the moment of this writing: * automake 1.13 * autoconf 2.69 Any thoughts on what this means?