Patch #511193: Implement killpg in posixmodule.
diff --git a/configure.in b/configure.in
index f416dc3..bb7a28d 100644
--- a/configure.in
+++ b/configure.in
@@ -1423,7 +1423,7 @@
AC_CHECK_FUNCS(alarm chown chroot clock confstr ctermid ctermid_r execv \
flock fork fsync fdatasync fpathconf ftime ftruncate \
gai_strerror getgroups getlogin getpeername getpid getpwent getwd \
- hstrerror inet_pton kill link lstat mkfifo mktime mremap \
+ hstrerror inet_pton kill killpg link lstat mkfifo mktime mremap \
nice pathconf pause plock poll pthread_init \
putenv readlink \
select setegid seteuid setgid setgroups \