Keith Packard, please seek professional help.

#!/bin/sh
for i in "$@"; do
        if grep -q '<config.h>' $i; then
                echo $i already has config.h
        else
                chmod +w $i
                ed $i << EOF
/^#/
i
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
.
w
q
EOF
        fi
done

Xizzle: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.4.1, dynamically linked (uses shared libs), stripped
Xizzle.unstripped: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.4.1, dynamically linked (uses shared libs), not stripped
-rwxrwxr-x 1 daniel daniel 799K Mar 11 00:32 Xizzle
-rwxrwxr-x 1 daniel daniel 9.5M Mar 11 00:32 Xizzle.unstripped
-rwxr-xr-x 1 root root 1.8M Sep 27 18:41 /usr/X11R6/bin/XFree86

I'm going to bed now.