Patch #568235: Add posix.setpgid.
diff --git a/configure.in b/configure.in
index 88025bc..35b890d 100644
--- a/configure.in
+++ b/configure.in
@@ -1621,7 +1621,7 @@
# checks for library functions
AC_CHECK_FUNCS(alarm chown chroot clock confstr ctermid ctermid_r execv \
fchdir flock fork fsync fdatasync fpathconf ftime ftruncate \
- gai_strerror getgroups getlogin getpeername getpid getpwent getwd \
+ gai_strerror getgroups getlogin getpeername getpgid getpid getpwent getwd \
hstrerror inet_pton kill killpg link lstat mkfifo mknod mktime mremap \
nice pathconf pause plock poll pthread_init \
putenv readlink \